Mommy tweets: Christina Aguilera's baby, Jaime King, Liv Tyler, Blake Lively

We rounded up the most buzz-worthy celebrity moms on social media including Christina Aguilera, who shared the most adorable photo of her daughter Summer Rain. Actress Jaime King announced she is pregnant, with help from her son James, while Liv Tyler welcomed a baby boy . New mom Blake Lively and Cindy Crawford round out our list of trending celebrity moms.