This just in...

When the legendary PRINCE, who just turned 50, throws a party, the stars turn out in force, Jet magazine reports in its issue on newsstands Monday. His royal purple-ness celebrated the release of his first book, 21 Nights, in style with a private party and a concert at his home in Los Angeles. The guests for the A-list bash included DIDDY, SYLVESTER STALLONE, BABYFACE, EDDIE MURPHY, CHRISTINA MILIAN and Dr. PHIL and ROBIN McGRAW.

"When Prince is in the room, there are no other celebrities. Not when his majesty saunters into the room," guest KARRINE STEFFANS, author of The Vixen Diaries told the magazine. "He's magnetic and electrifying. The crowd became entranced."

As ET reported in May, the multiple Grammy Award winner's 21 Nights goes behind the scenes of his record-breaking, sold-out 21 concerts in 21 nights at London's 02 Arena in 2007, and also includes 124 full-color, never-before-seen photographs.

"We are tremendously honored and excited by this opportunity to present this lyrical and visually rich book from Prince that captures the spirit and voluptuous sound of his brilliant 21-night residency at the O2 concert hall in London," says JUDITH CURR of Atria Books. "21 Nights is an innovative multi-media book project created by a musical visionary and uncompromising artist, an invitation to experience a side Prince has not revealed until now."

21 Nights hits bookstore shelves on Tuesday, September 9.