Nick Lachey's wife pregnant with baby girl

Pop star and TV personality Nick Lachey and his wife Vanessa are expecting their second child.

The father-to-be shared the news with his Twitter.com followers on Tuesday (15Jul14) as he and actress/TV personality Vanessa Lachey celebrated their third wedding anniversary by posting a photo of a heart drawn in the sand with the message, "It's a girl".

In the accompanying caption, Lachey wrote, "Can't think of a better way to celebrate 3 years of marriage to my beautiful Vanessa than this."

The baby will be a little sister for their 22-month-old son Camden.

Lachey's big news comes just 10 days after his ex-wife, Jessica Simpson, tied the knot with former American footballer Eric Johnson.

Simpson and Lachey were married from 2002 to 2006.