Diana Rosscelebrated her birthday in a manner befitting her status as the Queen of Motown.

The iconic Supremes frontman turned 75 with a two-part celebration in Los Angeles on Tuesday night. The festivities began with a pre-party at the famed Hollywood hotspot Warwick on Sunset Boulevard, whereBeyoncé serenaded her with an impromptu version of “Happy Birthday.”

Members of Diana’s large family (daughterTracee Ellis Ross, sonEvan Ross, and daughter-in-lawAshlee Simpson, among others) as well as longtime friends like Motown founder Berry Gordy and a multitude of stars — includingSean “Diddy” Combs,Robin Thicke,DJ Khaled,Heidi Klum,Chris Rock,French Montana,Kris Jenner,Kourtney KardashianandKhloé Kardashian— all gathered around what Tracee dubbed “the biggest cake ever” to sing Diana “Happy Birthday.”

But when the 46-year-oldBlackishactress saw Beyoncé in the crowd she quickly called the “Single Ladies” songstress over to take the lead instead.

42/BACKGRID

Diana Ross leaves her 75th birthday party in Hollywood

Tracee Ellis-Ross.SPW/SplashNews.com

Tracee Ellis Ross Was Seen Leaving Her Mothers 75th Birthday At Warwick Night Club In Hollywood, CA

Hollywood To You/ BACKGRID

Kris Jenner and Khloe Kardashian attend Diana Ross’ 75th Birthday at Warwick nightclub

Koutney Kardashian.Bauer-Griffin/SplashNews.com

1

Bey, of course, delivered a “***flawless” version of the tune. Her hair pulled back in a long braided ponytail and wearing a black gown, she commanded the room. Everyone stayed silent as she sang the melody to a beaming Diana.

Chris Rock.Bauer-Griffin/SplashNews.com

Celebrities Outside Warwick Nightclub in Hollywood

Heidi Klum.Bauer-Griffin/SplashNews.com

Celebrities Outside Warwick Nightclub in Hollywood

Stevie Wondermade a special appearance at the midpoint of the evening, singing his own rendition of “Happy Birthday” to Diana. Not to be outdone,Leonardo DiCaprio(who brought his mom!) appeared onstage to wish Diana well. “Happy birthday to the legend, Diana Ross,” he exclaimed,according to E! News.

Robin Thicke teamed with Diana for a stirring version of the sweeping ballad “Endless Love,” while Ross’ son Evan and daughter-in-law Ashlee Simpson dueted on “Love Hangover.”

Evan Ross and Ashlee Simpson.SPW/SplashNews.com

Evan Ross And Wife Ashlee Simpson Were Seen At Dianna Ross’s 75th Birthday Party At ‘Warwick’ Night Club In Hollywood, CA

Before the party was over, Diana invited the Kardashians in attendance onto the stage for a dance party to “Take Me Higher” from 1995.

“Khloe, Kourtney and Kris seemed to have a blast — they danced nonstop,” the insider says. As Diana tackled “Ease on Down the Road” next, she welcomed Evan and Tracee to the stage, too.

But the highlight of the evening occurred with Diana served up a show-stopping rendition of her soaring 1970 Motown classic “Ain’t No Mountain High Enough.”

“Diana was smiling from ear to ear all night,” the insider tells PEOPLE. “You could tell she thought it was a great birthday celebration.”

source: people.com