Janet Jackson gets an onstage surprise celebrating her no. 1 album

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Janet Jackson got a big surprise at the end of her sold out concert at the Forum in Inglewood, Calif., on Oct. 16.

At the show -- which boasted a crowd filled with celebrities including Beyonce, Queen Latifah and Channing Tatum -- Jackson thanked the audience for helping make her new album, Unbreakable, No. 1. The set debuted atop the Billboard 200 chart last week, giving the diva her seventh chart-topper, and making her only the third act with No. 1s in each of the past four decades.

"I want to thank you for making the Unbreakable album No. 1," Jackson told the audience. (Watch a fan-shot video of the moment below.) She went on to thank her fans for their continued support, specifically noting how her "family has been in the entertainment business for 50 years."

Then, she turned around, and the show seemingly went off-script. Jackson's eyes widened and her mouth fell open when she saw that her longtime collaborators, Jimmy Jam and Terry Lewis, had joined her on stage. (Jam and Lewis co-produced and co-wrote Unbreakable with Jackson, along with the bulk of her earlier catalog.) Jam embraced Jackson as a huge framed blowup of the Unbreakable album cover was rolled out on to the stage behind them.

"Oh my gosh, Terry!" Jackson exclaimed when she saw Lewis armed with a huge bouquet of white flowers. "What are you guys doing?" Jackson said, giggling. "Jimmy?"

Jam took to the mic and said, "So if you ever wanted to know what Janet Jackson looks like when she's totally surprised, this is it, L.A. This is it. So, I just want to say real quick, first of all, I want to congratulate each and every one in this arena right now, because a No. 1 does not happen without all of you."

Jackson nodded in agreement, looked out at the audience, and then pointed to the sky.

Jam continued, "But tonight is a very special night because it was around 30 years ago -- if you can believe that -- that we first got together in a little town called Minneapolis, Minnesota. And we had the first chance to work with Janet."

Jackson interjected, "But we knew each other before then. We first met when I was 14." Jam agreed, "Yeah, that's true!"

"So, we're not only celebrating the history," Jam went on, "but the best part about it is we're celebrating the right now, the right here tonight. So listen, we just wanted to celebrate with everybody here in L.A. tonight. It's very special, because, trust me -- she says it in the song -- you don't know what you got 'til it's gone. We waited seven years for a new project, and guess what? She's back! We love you, Janet."

Jam and Lewis embraced Jackson once more, and then departed the stage, leaving Jackson to finish her final song of the night: Unbreakable's title track.

To see more of Janet Jackson throughout the years, scroll through the gallery below:

Janet Jackson
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Janet Jackson gets an onstage surprise celebrating her no. 1 album
Janet Jackson arrives at amfAR's 20th Annual Cinema Against AIDS at Hotel du Cap-Eden-Roc on May 23, 2013 in Cap d'Antibes, France. (Photo by Tony Barson/FilmMagic,)
Janet Jackson, nominated for nine American Music awards, stands backstage at the Shrine Auditorium in Los Angeles, Ca., Monday night, Jan. 27, 1987. Jackson received the crystal award for favorite soul and rhythm-and-blues single with her hit "Nasty." (AP Photo/Lennox McLendon)
Singer Janet Jackson is shown performing Thursday, March 1, 1990 in Miami Arena during a performance which kicks off her "Rhythm Nation World Tour 1990." She performs next in Chapel Hill, North Carolina on March 3. (AP Photo/Bill Cookie)
Singing star Janet Jackson is shown in 1993.. (AP Photo)
Janet Jackson performs during her first concert to kick off "The Velvet Rope World Tour" Thursday, July 9, 1998, at the MCI Center in Washington.(AP Photo/Wilfredo Lee)
Janet Jackson accepts her Award of Merit at the 28th Annual American Music Awards in Los Angeles Monday, Jan. 8, 2001. (AP Photo/Michael Caulfield)
Janet Jackson performs " All Night (Don't Stop)" during the 4th annual BET Awards, Tuesday, June 29, 2004, in Los Angeles. (AP Photo/Kevork Djansezian)
Janet Jackson performs during a taping of the "On Air with Ryan Seacrest Show" inside Hollywood and Highland in Los Angeles, Calif., April 2, 2004 (AP Photo/Chris Polk)
Janet Jackson greets fans after she performed on the NBC "Today" television program in New York's Rockefeller Center, Friday Sept. 29, 2006. Jackson is looking to reverse disappointments with release of new album, "20 Y.O." that celebrates the 20th anniversary of her breakthrough album, "Control." (AP Photo/Richard Drew)
Singer Janet Jackson appears at a signing of her new CD "20 Y.O." at the Virgin Megastore, Tuesday, Sept. 26, 2006, in New York. (AP Photo/Paul Hawthorne)
Janet Jackson poses for a photo in Beverly Hills, Calif. Thursday, Oct. 4, 2007. (AP Photo/Damian Dovarganes)
Jamie Foxx, center, gets a kiss on the cheek from Janet Jackson, left, and Jennifer Hudson as they pose for a photo at a party hosted by Foxx and "Giant" magazine to celebrate Oscar Nominee Jennifer Hudson on Wednesday, Feb. 21, 2007 in Beverly Hills, Calif. (AP Photo/Danny Moloshok)
Janet Jackson arrives at the 11th annual Hollywood awards gala ceremony Monday Oct. 22, 2007, in Beverly Hills, Calif. (AP Photo/Matt Sayles)
Singer Janet Jackson performs during an appearance on MTV's "Total Request Live", Tuesday, Feb. 26, 2008 in New York. (AP Photo/Evan Agostini)
MILAN, ITALY - FEBRUARY 25: Janet Jackson attends the Giorgio Armani fashion show as part of Milan Fashion Week Womenswear Fall/Winter 2013/14 on February 25, 2014 in Milan, Italy. (Photo by Vittorio Zunino Celotto/Getty Images)
LOS ANGELES, CA - SEPTEMBER 08: Janet Jackson attends the Dylan's Candy Bar Los Angeles Opening at Original Farmers Market on September 8, 2012 in Los Angeles, California. (Photo by John Sciulli/WireImage)
ANTIBES, FRANCE - MAY 24: Janet Jackson arrives at the 2012 amfAR's Cinema Against AIDS during the 65th Annual Cannes Film Festival at Hotel Du Cap on May 24, 2012 in Cap D'Antibes, France. (Photo by Dominique Charriau/WireImage)
NEW YORK, NY - MAY 10: Janet Jackson attends the Marco Glaviano 'Supermodels' exhibition opening at the Keszler Gallery on May 10, 2012 in New York City. (Photo by Jim Spellman/WireImage)
MIAMI BEACH, FL - DECEMBER 05: Janet Jackson performs at Fillmore Miami Beach on December 5, 2011 in Miami Beach, Florida. (Photo by Larry Marano/Getty Images)
LONDON, ENGLAND - JUNE 30: Janet Jackson performs on her Janet Jackson Number Ones: Up Close & Personal Tour at The Royal Albert Hall on June 30, 2011 in London, England. (Photo by Dave J Hogan/Getty Images)
BERLIN, BERLIN - JUNE 24: US singer Janet Jackson performs live at the Tempodrom on June 24, 2011 in Berlin, Germany. (Photo by Marco Prosch/WireImage)
US singer Janet Jackson speaks during the 19th Life Ball in front of the city hall in Vienna, Austria, on May 21, 2011. The Life Ball is a charity gala to raise money for people living with HIV and AIDS.AFP PHOTO/JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)
Janet Jackson attends amfAR's Cinema Against AIDS Gala during the 64th Annual Cannes Film Festival at Hotel Du Cap on May 19, 2011 in Antibes, France. (Photo by Tony Barson/WireImage)

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