With a loving tribute on Instagram Friday, Nikki Reed celebrated husband Ian Somerhalder's 39th birthday Nikki Reed is revealing the secret to her “long happy marriage” with Ian Somerhalder.

Nikki Bella and Artem Chigvintsev are ... photo of the trio posing behind his birthday cake. "Happy Birthday to my sweet, shy, loving, wild one Matteo ️," she captioned the shot.