Kelly Ripa has taken to Instagram in celebration of her nephew's birthday, sharing a snapshot of the birthday boy with her fans.The family photo shows Sergio Giuseppe Ripa - son of Kelly's older sister Linda - smiling for the camera with his arm around a small black dog. "It's my nephew's birthday and Lena is pretty psyched about it! She's already singing! Happy birthday @maanbarepiig," Kelly, 50, captioned her post, adding a series of birthday cake emojis.The star's famous friends were quick to