Ashlee Simpson looks irresistible as Evan Ross kisses her at Michael Jackson’s diamond birthday bash

The late Michael Jackson would have turned 60 Wednesday.

So the stars turned out in full force at Mandalay Bay Resort And Casino in Las Vegas for a celebration in his honor, with guests including Ashlee Simpson and Evan Ross.

In addition to being Ashlee’s husband, 30-year-old Evan is the son of musical icon Diana Ross, who co-starred with Michael in the 1978 film adaptation of The Wiz.

Date night: he stars turned out to Mandalay Bay Resort And Casino in Las Vegas that day for a celebration in his honor, including Ashlee Simpson and Evan Ross

While at the diamond birthday bash for Michael Jackson, Evan planted a kiss on the cheek of his wife, who is the sister of singing star Jessica Simpson.

Ross had buttoned himself into a glittering striped short-sleeved top, slipping into black pants and rolling the hems slightly upward.

He added a dapper touch with a black hat and slid into a pair of black shoes, cinching a leather belt around his enviably trim waistline.

Meanwhile, Ashlee swept her platinum blonde hair back into a low bun, emphasizing her winning features with a heavy dose of makeup.

Keeping close: While at the diamond birthday bash for Michael Jackson, Evan planted a kiss on the cheek of his wife, who is the sister of singing star Jessica Simpson

Keeping close: While at the diamond birthday bash for Michael Jackson, Evan planted a kiss on the cheek of his wife, who is the sister of singing star Jessica Simpson

So swanky: Ashlee's glistening black mini-dress, which was cut off around mid-thigh, featured a plunging neckline and streaks of elaborate frills

So swanky: Ashlee’s glistening black mini-dress, which was cut off around mid-thigh, featured a plunging neckline and streaks of elaborate frills

Her glistening black mini-dress, which was cut off around mid-thigh, featured a plunging neckline and streaks of elaborate frills.

The event venue was apt – Mandalay Bay is the site of ONE, the Cirque Du Soleil show dedicated to the work of the late King Of Pop. 

Ashlee, who balanced that evening on barely-there ankle-strap stilettos, shares a three-year-old daughter called Jagger with Evan and a nine-year-old son called Bronx by her first husband, Fall Out Boy’s Pete Wentz.

Yellow brick road: In addition to being Ashlee's husband, Evan is the son of musical icon Diana Ross, who co-starred with Michael in the 1978 film adaptation of The Wiz, above

Yellow brick road: In addition to being Ashlee’s husband, Evan is the son of musical icon Diana Ross, who co-starred with Michael in the 1978 film adaptation of The Wiz, above

The Wiz was based on a Broadway musical of the same name, which was in turn adapted from L. Frank Baum’s iconic novel The Wonderful Wizard Of Oz.

In the film version of The Wiz, written by Joel Schumacher and directed by Sidney Lumet, Diana played Dorothy Gale opposite Michael’s Scarecrow.

Michael died at the age of 50 in 2009 from a cardiac arrest he suffered after having had propofol administered as a sleep aid.

Family: Michael's daughter Paris Jackson was at the event with her older brother Prince

Family: Michael’s daughter Paris Jackson was at the event with her older brother Prince

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