Katy Perry says Meghan Markle’s wedding dress could have used 'one more fitting' (Exclusive)

Katy Perry’s going to tell it like it is!

The 33-year-old pop star opened up to ET’s Lauren Zima about this weekend’s biggest event – the Royal Wedding of Prince Harry and Meghan Markle – during Sunday’s night one of the American Idol finale.

“I would have done one more fitting,” Perry quipped of Markle’s stunning Givenchy gown. “I’m never not going to tell the truth! One more fitting, but I love you.”

She added that she preferred Kate Middleton’s 2011 Alexander McQueen bridal look, adding, “Kate, Kate, Kate won, Kate won!”

See photos of Meghan Markle's dress:

44 PHOTOS
Meghan Markle stuns in wedding gown
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Meghan Markle stuns in wedding gown
US actress Meghan Markle arrives for the wedding ceremony to marry Britain's Prince Harry, Duke of Sussex, at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Ben Birchall / POOL / AFP) (Photo credit should read BEN BIRCHALL/AFP/Getty Images)
Meghan Markle arrives at St George's Chapel at Windsor Castle for her wedding to Prince Harry.
US actress Meghan Markle arrives for the wedding ceremony to marry Britain's Prince Harry, Duke of Sussex, at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Andrew Matthews / POOL / AFP) (Photo credit should read ANDREW MATTHEWS/AFP/Getty Images)
Meghan Markle arrives at St George's Chapel at Windsor Castle for her wedding to Prince Harry.
Pageboys hold the train of the dress of Meghan Markle as she arrives at St George's Chapel at Windsor Castle for her wedding to Prince Harry.
US actress Meghan Markle arrives for the wedding ceremony to marry Britain's Prince Harry, Duke of Sussex, at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Ben STANSALL / POOL / AFP) (Photo credit should read BEN STANSALL/AFP/Getty Images)
Meghan Markle and her bridal walk down the aisle of St George's Chapel at Windsor Castle for her wedding to Prince Harry.
Prince Harry looks at his bride, Meghan Markle, as she arrives accompanied by the Prince of Wales in St George's Chapel at Windsor Castle for their wedding.
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry and Meghan Markle during their wedding ceremony in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Owen Humphreys - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex, (L) and US fiancee of Britain's Prince Harry Meghan Markle arrive at the High Altar for their wedding ceremony in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jonathan Brady / POOL / AFP) (Photo credit should read JONATHAN BRADY/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Meghan Markle arrives at St George's Chapel at Windsor Castle for her wedding to Prince Harry on May 19, 2018 in Windsor, England. (Photo by Brian Lawless - WPA Pool/Getty Images)
WINDSOR, ENGLAND - MAY 19: Meghan, Duchess of Sussex in the Ascot Landau carriage during the procession on The Long Walk after getting married St George's Chapel, Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Richard Heathcote/Getty Images)
Britain's Prince Harry, Duke of Sussex (L) and Britain's Meghan Markle, Duchess of Sussex, (R) walk away from the High Altar toward the West Door to exit at the end of their wedding ceremony in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Owen Humphreys / POOL / AFP) (Photo credit should read OWEN HUMPHREYS/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex leave St George's Chapel, Windsor Castle after their wedding ceremony on May 19, 2018 in Windsor, England. (Photo by Andrew Matthews - WPA Pool/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry and Meghan Markle leave St George's Chapel after their wedding in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Ben Birchall - WPA Pool/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Meghan Markle stands at the altar during her wedding in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Jonathan Brady - WPA Pool/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry, Duke of Sussex and The Duchess of Sussex leave St George's Chapel, Windsor Castle after their wedding ceremony on May 19, 2018 in Windsor, England. (Photo by Andrew Matthews - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex, (L) and US fiancee of Britain's Prince Harry Meghan Markle arrive at the High Altar for their wedding ceremony in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jonathan Brady / POOL / AFP) (Photo credit should read JONATHAN BRADY/AFP/Getty Images)
TOPSHOT - Britain's Prince Harry, Duke of Sussex, (L) and US fiancee of Britain's Prince Harry Meghan Markle arrive at the High Altar for their wedding ceremony in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jonathan Brady / POOL / AFP) (Photo credit should read JONATHAN BRADY/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry lifts the veil of Meghan Markle during their wedding ceremony in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Owen Humphreys - WPA Pool/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry looks at his bride, Meghan Markle during their wedding service conducted by the Archbishop of Canterbury Justin Welby in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Owen Humphreys - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex, (L) and US fiancee of Britain's Prince Harry Meghan Markle arrive at the High Altar for their wedding ceremony in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jonathan Brady / POOL / AFP) (Photo credit should read JONATHAN BRADY/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Meghan Markle smiles during her wedding to Prince Harry in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Jonathan Brady - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex, (L) and US fiancee of Britain's Prince Harry Meghan Markle arrive at the High Altar for their wedding ceremony in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Jonathan Brady / POOL / AFP) (Photo credit should read JONATHAN BRADY/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Meghan Markle smiles during her wedding to Prince Harry in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Jonathan Brady - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex (L) and US fiancee of Britain's Prince Harry Meghan Markle stand together for their wedding in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry and Meghan Markle during their wedding ceremony in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Owen Humphreys - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex (L) sits with US actress Meghan Markle (R) during the reading in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018 during their wedding ceremony. (Photo by Owen Humphreys / POOL / AFP) (Photo credit should read OWEN HUMPHREYS/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry and Meghan Markle during their wedding ceremony in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Owen Humphreys - WPA Pool/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry and Meghan Markle during their wedding ceremony in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Owen Humphreys - WPA Pool/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry and Meghan Markle during their wedding service, conducted by the Archbishop of Canterbury Justin Welby in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry and Meghan Markle during their wedding service, conducted by the Archbishop of Canterbury Justin Welby in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Dominic Lipinski - WPA Pool/Getty Images)
Britain's Prince Harry, Duke of Sussex (L) sits with US actress Meghan Markle (R) during the reading in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018 during their wedding ceremony. (Photo by Owen Humphreys / POOL / AFP) (Photo credit should read OWEN HUMPHREYS/AFP/Getty Images)
Britain's Prince Harry, Duke of Sussex (R) and US actress Meghan Markle (L) stand facing each other hand-in-hand before Archbishop of Canterbury Justin Welby (C) during their wedding ceremony in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Owen Humphreys / POOL / AFP) (Photo credit should read OWEN HUMPHREYS/AFP/Getty Images)
Britain's Prince Harry, Duke of Sussex (R) and US actress Meghan Markle (L) stand facing each other hand-in-hand before Archbishop of Canterbury Justin Welby (C) during their wedding ceremony in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Owen Humphreys / POOL / AFP) (Photo credit should read OWEN HUMPHREYS/AFP/Getty Images)
Britain's Prince Harry, Duke of Sussex (L) and US fiancee of Britain's Prince Harry Meghan Markle stand together at the High Altar during their wedding ceremony in St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Dominic Lipinski / POOL / AFP) (Photo credit should read DOMINIC LIPINSKI/AFP/Getty Images)
WINDSOR, UNITED KINGDOM - MAY 19: Prince Harry places the wedding ring on the finger of Meghan Markle during their wedding service, conducted by the Archbishop of Canterbury Justin Welby in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. (Photo by Jonathan Brady - WPA Pool/Getty Images)
Prince Harry and Meghan Markle in St George's Chapel at Windsor Castle during their wedding.
WINDSOR, ENGLAND - MAY 19: Meghan Markle (R) with her mother Doria Ragland arrive at Windsor Castle ahead of her wedding to Prince Harry on May 19, 2018 in Windsor, England. Prince Henry Charles Albert David of Wales marries Ms. Meghan Markle in a service at St George's Chapel inside the grounds of Windsor Castle. Among the guests were 2200 members of the public, the royal family and Ms. Markle's Mother Doria Ragland. (Photo by Samir Hussein/WireImage)
WINDSOR, ENGLAND - MAY 19: Meghan Markle with her mother Doria Ragland (unseen) drive down the Long Walk as they arrive at Windsor Castle ahead of her wedding to Prince Harry on May 19, 2018 in Windsor, England. (Photo by Richard Heathcote/Getty Images)
Meghan Markle (R) and her mother, Doria Ragland, arrive for her wedding ceremony to marry Britain's Prince Harry, Duke of Sussex, at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Oli SCARFF / AFP) (Photo credit should read OLI SCARFF/AFP/Getty Images)
Meghan Markle leaves the Cliveden House Hotel, accompanied by her mother, Ms Doria Ragland, ahead of her wedding to Prince Harry at St George's Chapel at Windsor Castle.
Page boys John and Brian Mulroney accompany US actress Meghan Markle as she arrives in a car for the wedding ceremony to marry Britain's Prince Harry, Duke of Sussex, at St George's Chapel, Windsor Castle, in Windsor, on May 19, 2018. (Photo by Chris Radburn / POOL / AFP) (Photo credit should read CHRIS RADBURN/AFP/Getty Images)
Meghan Markle leaves the Cliveden House Hotel, accompanied by her mother, Ms Doria Ragland, ahead of her wedding to Prince Harry at St George's Chapel at Windsor Castle.
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Despite her slight criticism of Markle’s dress, Perry added, “I’m so happy for them, and, you know, I don’t know them from Adam, but it’s amazing what she’s doing with all this, her humanitarian efforts. You know, the fact that she’s a proud feminist, I love all that, so I support her as another woman and love her and wish them both well.”

Perry’s fellow Idol judge, Lionel Richie, also gave some insight into what this wedding meant to him.

“I remember when Di had them, Lady Di, and it was amazing and now to see them both married and kids, well not yet, but married,” Richie, 68, told ET. “She would be very proud. I must tell you, I mean, it’s a moment in time, but I’m glad to see they’re moving on as young men now, as family men. I love that.”

The finale of American Idol airs Monday on ABC at 8 p.m. ET.

10 PHOTOS
New 'American Idol' judges Katy Perry, Lionel Richie and Luke Bryan
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New 'American Idol' judges Katy Perry, Lionel Richie and Luke Bryan
AMERICAN IDOL - ABC's 'American Idol' judges Lionel Richie, Katy Perry and Luke Bryan. (Eric Liebowitz/ABC via Getty Images)
AMERICAN IDOL - American Idol, the iconic series that revolutionized the television landscape by pioneering the music competition genre, will return to airwaves on SUNDAY, MARCH 11 (8:00-10:00 p.m. EDT), at its new home on The ABC Television Network. (Eric Liebowitz/ABC via Getty Images) LIONEL RICHIE, KATY PERRY, LUKE BRYAN
NEW YORK, NY - OCTOBER 04: Lionel Richie, Katy Perry and Luke Bryan leave ABC's 'Good Morning America' in Times Square on October 4, 2017 in New York City. (Photo by James Devaney/GC Images)
AMERICAN IDOL - '101 (Auditions)' - The gold standard of all music competition series, American Idol, will make its highly anticipated return to television as superstar judges Luke Bryan, Katy Perry and Lionel Richie set out on a journey across the nation to discover a new crop of inspiring talent with a touch of Disney magic, as it premieres its first season at its new home on Americas network, The ABC Television Network, SUNDAY, MARCH 11 (8:00-10:01 p.m. EDT). (Eric Liebowitz via Getty Images) LIONEL RICHIE, KATY PERRY, LUKE BRYAN
AMERICAN IDOL - '101 (Auditions)' - The gold standard of all music competition series, American Idol, will make its highly anticipated return to television as superstar judges Luke Bryan, Katy Perry and Lionel Richie set out on a journey across the nation to discover a new crop of inspiring talent with a touch of Disney magic, as it premieres its first season at its new home on Americas network, The ABC Television Network, SUNDAY, MARCH 11 (8:00-10:01 p.m. EDT). (Eric Liebowitz via Getty Images) RYAN SEACREST, LIONEL RICHIE, KATY PERRY, LUKE BRYAN
AMERICAN IDOL - '101 (Auditions)' - The gold standard of all music competition series, American Idol, will make its highly anticipated return to television as superstar judges Luke Bryan, Katy Perry and Lionel Richie set out on a journey across the nation to discover a new crop of inspiring talent with a touch of Disney magic, as it premieres its first season at its new home on Americas network, The ABC Television Network, SUNDAY, MARCH 11 (8:00-10:01 p.m. EDT). (Eric Liebowitz via Getty Images) LUKE BRYAN, KATY PERRY, LIONEL RICHIE
PASADENA, CA - JANUARY 08: (L-R, Back Row) Showrunner/executive producer Trish Kinane, co-executive producer Megan Michaels Wolflick (l-r, front row) host Ryan Seacrest, judges Luke Bryan, Katy Perry and Lionel Richie of the television show American Idol speak onstage during the ABC Television/Disney portion of the 2018 Winter Television Critics Association Press Tour at The Langham Huntington, Pasadena on January 8, 2018 in Pasadena, California. (Photo by Frederick M. Brown/Getty Images)
(L-R) Singers/Songwriters Luke Bryan, Katy Perry and Lionel Richie attend the Disney ABC Television TCA Winter Press Tour on January 8, 2018, in Pasadena, California. / AFP PHOTO / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
(L-R) Singers/Songwriters Luke Bryan, Katy Perry and Lionel Richie attend the Disney ABC Television TCA Winter Press Tour on January 8, 2018, in Pasadena, California. / AFP PHOTO / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
TCA WINTER PRESS TOUR 2018 - 'American Idol' Happy Hour - The cast and executive producers of 'American Idol' addressed the press at Disney | ABC Television Group's Winter Press Tour 2018. (Image Group LA/ABC via Getty Images) LUKE BRYAN, KATY PERRY, LIONEL RICHIE
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