George Clooney is 50: Celebrates with Elisabetta Canalis, natch.

clooney50.jpg George Clooney -- two-time winner of People's Sexiest Man Alive title -- hits the half-century mark on Friday (May 6). On Thursday (May 5), the Kentucky-born actor celebrated with longtime girlfriend Elisabetta Canalis at Beverly Hills eatery Mr. Chow's.

We know this not because the couple was captured on film by the paparazzi or let it drop via a publicist, but because "Dancing with the Stars" contender and erstwhile actress Kirstie Alley tweeted about it.

A committed Twitter user, Alley (who probably has no privacy filter to speak of anymore) managed to carry on a back-and-forth with Jackie Collins while dining. The two pretty much confined their comments to star spotting.

"Fun dinner at CHOWS," tweeted Collins. "With Kathy Griffin. Spotted George Clooney & beautiful gf Elizabetta. Also Kirsti Alley looking major svelte."

"Happy birthday George Clooney," Alley chimed in. "Great to see u.. Better to hug u."

We're sure he was equally thrilled.

In honor of George's 50th, take a spin through our gallery: George Clooney: 50 photos for 50 years.
Photo/Video credit: Getty Images