Ryan Phillippe and Reese Witherspoon's 8-year-old daughter, Ava, seems mighty comfy around her dad's actress flame, Abbie Cornish.

Phillippe and Cornish, 25, took Ava and her 4-year-old brother, Deacon, 4, Christmas shopping in L.A. on the weekend, Us Weekly is reporting.

"Ava seemed very comfortable with Abbie….(she) picked a wreath and Abbie put it around her head as a joke. They were both laughing," an eyewitness told the magazine.

Cornish and the now-divorced Phillippe are said to have been seeing each other when he split from Reese Witherspoon October last.

I guess that's the lot of a Hollywood child…learning to adjust to the revolving door that is your parent's love life!