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

Janet Jackson Brand New Album Unveiled

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,)
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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