Katy Perry ranks her ex-boyfriends in bed, reveals the surprising 'one that got away'


Katy Perry kisses and tells!

The "Swish Swish" singer shockingly revealed her personal romantic ranking to James Corden during her 72-hour YouTube livestream on Sunday, in the lead-up to the release of her new album, Witness.

WATCH:Katy Perry Previews New Album 'Witness,' Goes Live on YouTube in 'Big Brother'-Style House

The ratings came during a question and answer game with Corden, where the alternative to answering was to consume a questionable snack.

The Late Late Show host asked the 32-year-old pop star to rank her exes from best to worst in bed, "working on the notion that they're all good."

Perry protested vehemently at first: "They're all amazing lovers and I would have sex with all of them after I get out of this place!" she told Corden.

30 PHOTOS
Katy Perry out and about
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Katy Perry out and about
SANTA MONICA, CA - APRIL 06: Katy Perry attends Caroline De Maigret and Pharrell Williams dinner in celebration of CHANEL's Gabrielle Bag at Giorgio Baldi on April 6, 2017 in Santa Monica, California. (Photo by Donato Sardella/Getty Images for CHANEL)
LOS ANGELES, CA - MARCH 25: Katy Perry celebrates Elton John's 70th Birthday and 50-Year Songwriting Partnership with Bernie Taupin benefiting the Elton John AIDS Foundation and the UCLA Hammer Museum at RED Studios Hollywood on March 25, 2017 in Los Angeles, California. (Photo by Michael Kovac/Getty Images)
LOS ANGELES, CA - MARCH 18: Katy Perry attends the Human Rights Campaign's 2017 on March 18, 2017 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
LOS ANGELES, CA - MARCH 18: Katy Perry attends the Human Rights Campaign's 2017 Los Angeles Gala Dinner at JW Marriott Los Angeles at L.A. LIVE on March 18, 2017 in Los Angeles, California. (Photo by Todd Williamson/Getty Images)
INGLEWOOD, CA - MARCH 05: Katy Perry attends the 2017 iHeartRadio Music Awards at The Forum on March 5, 2017 in Inglewood, California. (Photo by C Flanigan/Getty Images)
INGLEWOOD, CA - MARCH 05: Katy Perry attends the 2017 iHeartRadio Music Awards at The Forum on March 5, 2017 in Inglewood, California. (Photo by JB Lacroix/WireImage)
INGLEWOOD, CA - MARCH 05: Singer Katy Perry performs onstage at the 2017 iHeartRadio Music Awards which broadcast live on Turner's TBS, TNT, and truTV at The Forum on March 5, 2017 in Inglewood, California. (Photo by Jeff Kravitz/FilmMagic)
INGLEWOOD, CA - MARCH 05: Musician Katy Perry performs onstage at the 2017 iHeartRadio Music Awards which broadcast live on Turner's TBS, TNT, and truTV at The Forum on March 5, 2017 in Inglewood, California. (Photo by Christopher Polk/Getty Images for iHeartMedia)
BEVERLY HILLS, CALIFORNIA - FEBRUARY 26: Katy Perry (R) and Derek Blasberg (L) pose as they arrive at the Vanity Fair Oscar Party in Beverly Hills, California, Los Angeles on February 26, 2017. (Photo by Philip Rock/Anadolu Agency/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 26: Singer Katy Perry arrives at the 2017 Vanity Fair Oscar Party Hosted By Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 26, 2017 in Beverly Hills, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
LONDON, UNITED KINGDOM - FEBRUARY 22: Katy Perry attends the Universal Music BRIT Awards After-Party 2017 hosted by Soho House and BACARDI Rum at 180 The Strand, on February 23, 2017 in London, England. PHOTOGRAPH BY Jules Annan / Barcroft Images London-T:+44 207 033 1031 E:hello@barcroftmedia.com - New York-T:+1 212 796 2458 E:hello@barcroftusa.com - New Delhi-T:+91 11 4053 2429 E:hello@barcroftindia.com www.barcroftimages.com (Photo credit should read Jules Annan / Barcroft Images / Barcroft Media via Getty Images)
LONDON, ENGLAND - FEBRUARY 22: Ellie Goulding and Katy Perry attend (R) the Universal Music BRIT Awards After-Party 2017 hosted by Soho House and BACARD�at 180 The Strand on February 22, 2017 in London, England. (Photo by David M. Benett/Dave Benett/ Getty Images for Universal, Soho House & Bacardi Rum )
LONDON, ENGLAND - FEBRUARY 22: EDITORIAL USE ONLY. Katy Perry attends The BRIT Awards 2017 at The O2 Arena on February 22, 2017 in London, England. (Photo by Samir Hussein/Samir Hussein/Redferns)
LONDON, ENGLAND - FEBRUARY 22: EDITORIAL USE ONLY. (L) Katy Perry and Skip Marley perform on stage at The BRIT Awards 2017 at The O2 Arena on February 22, 2017 in London, England. (Photo by Dave J Hogan/Getty Images)
LONDON, ENGLAND - FEBRUARY 21: Katy Perry seen at BBC Radio One on February 21, 2017 in London, England. (Photo by Neil Mockford/GC Images)
LONDON, ENGLAND - FEBRUARY 20: Katy Perry attends at the Christopher Kane show during the London Fashion Week February 2017 collections on February 20, 2017 in London, England. (Photo by Antonio de Moraes Barros Filho/WireImage)
LONDON, ENGLAND - FEBRUARY 20: Katy Perry seen at Christopher Kane at Tate Britain on Day 4 of London Fashion Week February 2017 on February 20, 2017 in London, England. (Photo by SAV/GC Images)
NEW YORK, NY - FEBRUARY 16: Singer-songwriter Katy Perry is seen arriving at the Marc Jacobs Fall 2017 Show at Park Avenue Armory on February 16, 2017 in New York City. (Photo by Gilbert Carrasquillo/GC Images)
LOS ANGELES, CA - FEBRUARY 12: Singer Katy Perry arrives at the 59th GRAMMY Awards at the Staples Center on February 12, 2017 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
LOS ANGELES - FEBRUARY 12: Katy Perry performs during THE 59TH ANNUAL GRAMMY AWARDS, broadcast live from the STAPLES Center in Los Angeles, Sunday, Feb. 12 (8:00-11:30 PM, live ET/5:00-8:30 PM, live PT; 6:00-9:30 PM, live MT) on the CBS Television Network. (Photo by Monty Brinton/CBS via Getty Images)
LOS ANGELES, CA - FEBRUARY 12: Singer-songwriter Katy Perry arrives at the Universal Music Group's 2017 GRAMMY After Party at The Theatre at Ace Hotel on February 12, 2017 in Los Angeles, California. (Photo by Jeffrey Mayer/WireImage)
LOS ANGELES, CA - FEBRUARY 12: Singer Katy Perry attends the Universal Music Group's 2017 GRAMMY After Party at The Theatre at Ace Hotel on February 12, 2017 in Los Angeles, California. (Photo by Greg Doherty/Patrick McMullan via Getty Images)
LOS ANGELES, CA - FEBRUARY 12: Singer Katy Perry attends The 59th GRAMMY Awards at STAPLES Center on February 12, 2017 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NARAS)
WESTWOOD, CA - DECEMBER 07: Singer Katy Perry arrives at the Los Angeles Premiere of 'Office Christmas Party' at Regency Village Theatre on December 7, 2016 in Westwood, California. (Photo by Axelle/Bauer-Griffin/FilmMagic)
WESTWOOD, CA - DECEMBER 07: Katy Perry and Jennifer Aniston attend the Premiere of Paramount Pictures' 'Office Christmas Party' at Regency Village Theatre on December 7, 2016 in Westwood, California. (Photo by Todd Williamson/Getty Images)
NEW YORK, NY - NOVEMBER 30: (EXCLUSIVE COVERAGE) Katy Perry and Tony Winner Cynthia Erivo pose backstage at the hit musical 'The Color Purple' on Broadway at The Jacobs Theatre on November 30, 2016 in New York City. (Photo by Bruce Glikas/Bruce Glikas/FilmMagic)
NEW YORK, NY - NOVEMBER 29: Cindi Jaliher, Katy Perry (C), and Carol Edwards attend the 12th annual UNICEF Snowflake Ball at Cipriani Wall Street on November 29, 2016 in New York City. (Photo by Kevin Mazur/Getty Images for UNICEF )
NEW YORK, NY - NOVEMBER 29: Singer Katy Perry attends the 12th Annual UNICEF Snowflake Ball at Cipriani Wall Street on November 29, 2016 in New York City. (Photo by Noam Galai/WireImage)
NEW YORK, NY - NOVEMBER 29: Katy Perry attends the 12th Annual UNICEF Snowflake Ball at Cipriani Wall Street on November 29, 2016 in New York City. (Photo by Michael Loccisano/Getty Images)
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Eventually. her final ranking listed Diplo, whom she dated briefly in 2014, at the bottom, followed by recent ex-boyfriend Orlando Bloom, with John Mayer -- with whom she had an on-and-off relationship that ended in 2015 -- at the top.

But there was one more man worth mentioning: Josh Groban, whom Perry referred to as "the one that got away," after they were linked together in 2009.

Perry inhabited a Big Brother-style house for the duration of the livestream, opening her life up to the public for 72-hours, which included an emotional therapy session.

Find out more in the video above.

25 PHOTOS
Katy Perry through the years
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Katy Perry through the years
FLORENCE, ITALY - JUNE 18: Katy Perry poses backstage prior to the Moschino show during the 88 Pitti Uomo on June 18, 2015 in Florence, Italy. (Photo by Vittorio Zunino Celotto/Getty Images)
TANGERANG, INDONESIA - MAY 9: Katy Perry performs on the stage during her 'Prismatic' world tour concert at Indonesia Convention Extibition, Tangerang, Indonesia on May 9, 2015. This is the second concert Katy Perry in Indonesia. (Photo by Kharisma Aris/Anadolu Agency/Getty Images)
INDIO, CA - APRIL 12: Mia Moretti (2ndL) and Katy Perry (C) with guests in the VIP arena during the 2015 Coachella Valley Music and Arts Festival - Weekend 1 at The Empire Polo Club on April 12, 2015 in Indio, California. (Photo by Rachel Murray/Getty Images for Coachella)
LOS ANGELES, CA - MARCH 26: Singer Katy Perry takes a selfie with fans at the screening of EPIX's 'Katy Perry: The Prismatic World Tour' at The Theatre at Ace Hotel Downtown LA on March 26, 2015 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
US singer Katy Perry performs at the Ziggo Dome in Amsterdam, on March 09, 2015 as part of her Prismatic World Tour. AFP PHOTO/ANP/FERDY DAMMAN - netherlands out - (Photo credit should read Ferdy Damman/AFP/Getty Images)
PARIS, FRANCE - MARCH 08: (L-R) Kanye West, Kim Kardashian and Katy Perry attend the Givenchy show as part of the Paris Fashion Week Womenswear Fall/Winter 2015/2016 on March 8, 2015 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)
LOS ANGELES, CA - FEBRUARY 08: Singer Katy Perry attends The 57th Annual GRAMMY Awards at the STAPLES Center on February 8, 2015 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
GLENDALE, AZ - FEBRUARY 01: Singer Katy Perry performs during the Pepsi Super Bowl XLIX Halftime Show at University of Phoenix Stadium on February 1, 2015 in Glendale, Arizona. (Photo by Tom Pennington/Getty Images)
GLENDALE, AZ - FEBRUARY 01: Recording artist Katy Perry performs onstage during the Pepsi Super Bowl XLIX Halftime Show at University of Phoenix Stadium on February 1, 2015 in Glendale, Arizona. (Photo by Christopher Polk/Getty Images)
PHOENIX, AZ - JANUARY 29: Singer Katy Perry speaks during the Pepsi Super Bowl XLIV Halftime Show Press Conference at the Phoenix Convention Center on January 29, 2015 in Phoenix, Arizona. (Photo by Mike Lawrie/Getty Images)
SYDNEY, AUSTRALIA - NOVEMBER 26: Katy Perry takes a selfie with fans at the 28th Annual ARIA Awards 2014 at the Star on November 26, 2014 in Sydney, Australia. (Photo by Ryan Pierse/Getty Images)
WASHINGTON, DC - JULY 31: (AFP OUT) Singer Katy Perry performs during a concert commemorating the Special Olympics with U.S. President Barack Obama, not pictured, in the State Dining Room of the White House on July 31, 2014 in Washington, D.C. Founded in 1968 by Eunice Kennedy Shriver, the Special Olympics movement has grown to more than 4.4 million athletes in 170 countries. (Photo by Andrew Harrer-Pool/Getty Images)
Pop star Katy Perry arrives on June 12, 2014 in Los Angeles, California, for an announcement where she is teaming up Staples to 'Make Roar Happen', celebrating and supporting teachers for a philanthropic effort during the back-to-school season. Besides donating $1 million to DonorsChoose.org, Staples will sponsor the North American leg of Katy Perrys Prismatic World Tour, which starts in Raleigh, North Carolina on June 22. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)
LAKE BUENA VISTA, FL - JULY 04: In this handout photo provided by Disney Parks, singer Katy Perry poses with Minnie Mouse and Mickey Mouse at Disney's Hollywood Studios at Walt Disney World Resort on July 4, 2014 in Lake Buena Vista, Florida. Katy Perry, who sang the hit song 'Firework,' visited Walt Disney World Resort on U.S. Independence Day during a break in her global 'Prismatic' concert tour. (Photo by Chloe Rice/Disney Parks via Getty Images)
LONDON, ENGLAND - FEBRUARY 18: Katy Perry attends the Elle Style Awards 2014 at one Embankment on February 18, 2014 in London, England. (Photo by Anthony Harvey/Getty Images)
LOS ANGELES, CA - JANUARY 27: Recording artist Katy Perry performs onstage during 'The Night That Changed America: A GRAMMY Salute To The Beatles' at the Los Angeles Convention Center on January 27, 2014 in Los Angeles, California. (Photo by Kevin Winter/Getty Images for NARAS)
NEW YORK - FEBRUARY 04: Singer Katy Perry attends the Betsey Johnson 2008 fashion show during Mercedes-Benz Fashion Week Fall 2008 at The Tent at Bryant Park on February 4, 2008 in New York City. (Photo by Stephen Lovekin/Getty Images for IMG)
CULVER CITY, CA - MAY 30: Singer Katy Perry performs onstage during the taping of Spike TV's 2nd Annual 'Guys Choice' Awards held at Sony Studios on May 30, 2008 in Culver City, California. The show airs on June 22, 2008 at 10PM ET/PT on Spike TV. (Photo by Alberto E. Rodriguez/Getty Images)
LOS ANGELES, CA - JUNE 17: Musician Katy Perry attends the Katy Perry record release party for 'One of the Boys' at Capitol Records on June 17, 2008 in Los Angeles, California. (Photo by Jesse Grant/Getty Images for EMI Music)
NEW YORK - SEPTEMBER 05: Katy Perry arrives in Bryant Park during the Mercedes-Benz Fashion Week Spring 2008 on September 5, 2007 in New York City. (Photo by Katy Winn/Getty Images for IMG)
LOS ANGELES - MAY 5: Singer Katy Perry arrives at the H.D. Buttercup Grand Opening Celebrity Treasure Hunt at the H.D. Buttercup at the Helms Bakery Building May 5, 2005 in Los Angeles, California. (Photo by Phil McCarten/Getty Images)
WEST HOLLYWOOD, CA - FEBRUARY 27: Singer Katy Perry arrives at The Abbey / Esquire Magazine 'The Envelope Please' Oscar Viewing Party on February 27, 2005 at The Abbey in West Hollywood, California. (Photo by Amanda Edwards/Getty Images)
BEVERLY HILLS, CA - FEBRUARY 23: Singer Katy Perry during the Jimmy Choo annual Oscar Collection Preview and Tea at the Peninsula Hotel on February 23, 2004 in Beverly Hills, California. (Photo by Amanda Edwards/Getty Images)
SAO PAULO, BRAZIL - SEPTEMBER 24: Singer Katy Perry performs live at Arena Allianz Parque on September 25, 2015 in Sao Paulo, Brazil. (Photo by Daniel Vorley/Getty Images)
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