Demi Moore kicked off her 51st birthday by partaking in one of the things that's keeping her so darn hot at 51.
The ever-fit Scorpio took a 90-minute Kundalini yoga and meditation class with Rumer Willis this morning at Nine Treasures Yoga in Hollywood.
Mother and daughter set up their mats next to each other "and appeared to be having a wonderful time together," a source exclusively told E! News.
Demi, wearing all black, looked "radiant," the source added. "She was obviously very happy, surrounded by her yoga friends and daughter Rumer. She was actually beaming. She was smiling the entire class. Everyone was having a great time."
We're told that the class' teacher, Tej Khalsa, wished the actress a happy birthday before class began, calling her a "wonderful" person who was born on a lucky day and who generously shares her luck with others.
After class, Demi's fellow students sang "Happy Birthday" and indulged in strawberry sponge cake, apples and chocolate. One of Demi's pals presented her a piece of cake with a candle and the birthday girl had also brought bottles of juice for her fellow practitioners.
Will Hannigan, a former rumored love interest of Demi's, was in class today, but they did not act romantically toward one another.