Magic Johnson Celebrates 25 Years of Marriage With Epic, Star-Studded Yacht Party: See His Wife's Giant Ring!

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Check out Cookie Johnson's new 30-carat ring.

We guarantee you've never seen an anniversary celebration like this.

Magic Johnson surprised his wife, Cookie, with a beyond lavish yacht party in Monaco to celebrate 25 years of marriage, and to call it spectacular would be an understatement. Magic and Cookie were already in Venice, Italy, celebrating their milestone anniversary, when the former NBA star flew in all of their friends to Monaco without Cookie's knowledge, a source tells ET. Magic, 57, also paid for all of the travel expenses.

Celeb guests included Samuel L. Jackson, Steve Harvey, LL Cool J, Smokey Robinson, Tina Knowles, Biz Markie, Bill Bellamy, Holly Robinson Peete, Cedric the Entertainer, Pat Riley, Sugar Ray Leonard, as well as their significant others.

WATCH: EXCLUSIVE -- Magic and Cookie Johnson Open Up About Supporting Kids EJ and Elisa Through Everything

"Happy 25th Anniversary to my best friend, my beautiful wife, @thecookiej! #EC25," Magic Instagrammed alongside a sweet pic of the couple dancing.

Magic's children -- Andre (whose mother is his ex, Melissa Mitchell), Elisa, and EJ Johnson of Rich Kids of Beverly Hills fame -- were also there to celebrate.

Clearly, all of the guests enjoyed themselves.

Check out Miss Tina getting her groove on to her daughter Beyonce's hit, "Get Me Bodied."

Guests dined on prawn and arugula salad, and ate ribeye steak, grilled lobster and John Dory fish for the main course. Magic obviously left no detail unturned, setting up C-shaped tables in honor of Cookie.

But the most jaw-dropping moment of the anniversary celebration had to be the stunning 30-carat diamond ring Magic bought for his beloved wife, which he presented her on Wednesday when they flew to St. Tropez. The legendary athlete had a Cirque du Soleil aerialist drop from the ceiling and deliver the ring box to Cookie, our source at the party tells ET. A fireworks display followed, and Smokey Robinson serenaded them. Singer Jeffrey Osborne and LL Cool J also performed.

Magic designed the ring with XIV Karats, a rep from the Beverly Hills, California, jeweler confirmed to ET. The 30-carat emerald cut ring, set with trapezoid sides and an eternity band of diamonds, is valued in the seven figure range. Check out a close-up of Cookie's dazzling new bling.

"This is a week-long celebration because as Magic put it, 'This woman deserves it,'" our source tells ET.

WATCH: EXCLUSIVE -- Magic Johnson on Charlie Sheen's HIV Announcement -- 'I Would Love for Him to Join That Fight With Me'

ET caught up with Cookie and Magic in June at the BET Awards, when Cookie, 57, couldn't help but gush over her son, EJ.

"I'm a proud mother," Cookie said. "I'm so happy [EJ] is out there doing his thing, no matter what the odds are, he's just being himself … and the world is loving it, and we love it."

"[My sister and I] are very much free," EJ also told ET when he stopped by our studio to chat about his new show, EJNYC, in June. "We're very, you know, confident and fearless people, and we don't really care what anyone thinks about the way we express ourselves. So, it's really great that they've allowed us to kind of just go out in the world and make it our own."

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