That's why he's "constantly" giving food to pregnant girlfriend Courtney Mazza, he tells PEOPLE

Baby Gavin "knows what he likes and what he doesn't like," says the Design Star judge

"Musicals? I just can't," says the singer, whose song was featured on the show

They quietly separated six months ago but "remain best of friends," a rep tells PEOPLE

"We would've loved to have been there by his side at the hospital," his mother Sue Coleman tells PEOPLE

PEOPLE banters with the competitors about hitting the road for three months beginning July 1