Alyssa Milano and hubby Dave Bugliari with son Milo

Get ready to feel old.

Alyssa Milano turns 40 years old Thursday! Happy birthday gorgeous girl!

The former “Who’s the Boss” star celebrated the big 4-0 a few days early with a prom-themed party since she missed her own prom as a teen. Us Weekly Magazine reported that Milano’s husband David Bugliari threw her a surprise party at The London in West Hollywood. Other celebrities in attendance included Ludacris, Ken Jeong and Brian Grazer.

According to the magazine, guests were able to take prom-style portraits in a photo booth and DJ Vicious-Lee played Alyssa’s favorite songs. One guest told the magazine, “Everyone had a great time! “Alyssa was really surprised. She had no clue!”