AceShowbiz - Busy Philipps has laughed off reports she underwent breast enhancement surgery while filming hit U.S. show "Cougar Town" - putting her inflated chest down to breastfeeding. The actress welcomed her daughter, Birdie, in 2008 and was soon on set playing Courteney Cox's character's assistant Laurie.

Rumors that Phillips had gone under the knife emerged after she was seen sporting a bigger bust than usual - but the 30 year old is adamant her enlarged assets were linked to her new role as a mother. She tells Britain's The 5 O'Clock Show, "That's insane. Here's what happened. I was breastfeeding when I started the show."

"I was a new mom so not only was I about 30 pounds heavier but my chest was about four sizes bigger than it is today. So I guess it wasn't real because it didn't last - it was filled with milk and not silicone."