05/17/2012 AT 6:00 AM ET
After picking up Ava, 12, and Deacon, 8, from school, Witherspoon took a tennis lesson at the private Brentwood Country Club along with three close girlfriends.
“Reese was in a good mood,” says an onlooker. “She was laughing with her girlfriends. They were all on the same side of the court and had tennis balls served at them by a trainer. It just seemed like a casual and relaxing practice game.”
And the onlooker adds of the pregnant actress: “Reese’s baby bump is getting bigger, and she looked very cute.”
With regard to Witherspoon’s fitness, the source says that she does still work out with a trainer at her house and they do strength training together. She has also been spotted hiking several times a week, and going for slow jogs around the Brentwood Country Club.
– Pernilla Cedenheim