Nick and Vanessa Lachey have another baby on the way.

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The couple, who wed in 2011, shared the happy news via Twitter and also revealed the sex of the baby.

"Can't think of a better way to celebrate 3 years of marriage to my beautiful Vanessa than this," Lachey tweeted.

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His tweet was accompanied by a photo of their 22-month old son, Camden John, running on the beach, along with the words "It's a girl" written in the sand.

This shouldn't come as much of a surprise since Mrs. Lachey, 33, previously spoke of her plans for more babies.

"We're always ready and want to have more kids," the star told Enstars last July.

She also boasted about her firstborn. "He is so determined. I see the drive in him. If he wants something, he'll go after it. It will be interesting, seeing that trait as he gets older and maybe takes it into sports, school or music. I see him having that drive to perfect things, so it'll be fun to watch," she said.

The 98 Degrees crooner and Vanessa, who share the same birthday, began dating in 2006 and tied the knot in July 2011. They wed on a tropical island in front of 35 of their closest friends and relatives.

It's the first marriage for the Dads actress and the second for Lachey, who was previously married to Jessica Simpson.

Tags: Nick Lachey vanessa lachey