Ryan Phillippe's Baby Girl: Ex-Girlfriend Shows Off Kai (PHOTO)

10/04/2011 04:00 pm ET | Updated Dec 04, 2011

Ryan Phillippe became a dad for the third time in July when he welcomed his daughter, Kailani Merizalde Phillippe Knapp, into the world with his ex-girlfriend, Alexis Knapp.

Knapp took to Twitter to share a pic of three-month-old Kai with her followers.

"I do declare you to be the prettiiiest lil girl in the whole wide world," she wrote, with a link to the picture.

It was revealed that Knapp was pregnant back in March, but it was not clear whether or not Phillippe was the father. However, the "Lincoln Lawyer" actor was spotted taking Knapp to doctor's appointments, and was reportedly at the hospital when Kai was born.

Check out the photo of cute little Kai below!

Alexis Knapp's photo I do declare you to be the prettiiiest lil girl in the whole wide world

Check out more photos of celebrities' kids below!

Ryan Phillippe