R&B singer Tamia and her NBA star husband Grant Hill are expecting their second child, the couple confirm to PEOPLE.

"I'm happy that the secret is out because it was getting very difficult to hide it," says Tamia, 31, who is four months along. "I performed yesterday and I caught a glimpse of myself in a reflection and I thought, 'Oh no, I'm going to have to talk about this."

Grant, 34, is "thrilled" about the new family addition and daughter Myla, 5, looks forward being "the coolest big sister ever," Tamia says.

The singer announced her pregnancy on her MySpace page.

Labels: Grant Hill, Tamia