Matthew Morrison has joined the growing cast of What to Expect When You're Expecting for Lionsgate Pictures.

The screenplay by Shauna Cross is based on the self-help book of the same name by Heidi Murkoff. The Glee star will play Evan, who is Cameron Diaz's partner on a celebrity dance show, and later decides to have a baby with her.

Other cast members include Jennifer Lopez, Brooklyn Decker, Anna Kendrick, Chris Rock, Elizabeth Banks, and Chace Crawford.

Kirk Jones is directing What to Expect When You're Expecting, which will shoot this summer.