On Thursday night all you had to do was follow Kirstie Alley on Twitter – or have a reservation at Mr. Chow.

The actor – who turns 50 on Friday – had an early celebration and dinner party at the Beverly Hills hot spot with girlfriend Elisabetta Canalis … and a ton of other celebrities.

Dancing with the Stars contestant Kirstie Alley and writer Jackie Collins both captured Clooney in action – and live Tweeted his birthday dinner. Wrote Alley: “Jeez… I’m having dinner and I swear this is the most star studded restaurant I’ve ever been in!!… Impressive!!!”

Collins was as impressed as her famous fellow diners. “Fun dinner at CHOWS. with Kathy Griffin. Spotted George Clooney & beautiful gf Elizabetta. Also Kirsti Alley looking major svelte,” she posted.

“Kirsti was with Kelly Preston, & wandering around were Ray Romano & Brad Garret. Quite a star studded night.”

Replied Alley: “u a bad ass Jackie… Great seeing u tonight.. Were we surrounded by beautiful men or what?? Mr. Chows it is every nite xxo.”

And Alley did not leave the restaurant unrewarded. “Happy birthday George Clooney,” she later Tweeted. “Great to see u.. Better to hug u.”