Nick Lachey and wife Vanessa Lachey have welcomed their second child into the world.

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The Sing-Off host and Vanessa, 34, are already parents to a two-year-old son Camden John. 

"She's HERE!!!! Nick, Camden and I are SO excited to announce the birth of our sweet, beautiful baby girl, Brooklyn Elisabeth Lachey! She was born January 5th, 2015 at 5:17pm. She weighed in at 7 pounds 15 ounces, is 21 inches long and has already won over all of our hearts," Vanessa announced on her personal website.

"I have been dreaming of this moment for as long as I can remember, the day I was going to meet my little girl. A friend recently told me how magical today was going to be because it's the day I would meet my best friend. I can't even begin to tell you how it felt to hold her in my arms for the very first time. Mommy, Daddy and big brother Cam love you so much already, Brooklyn!"

The reality TV couple made the announcement they were expecting a baby girl in July.

"Thank you to everyone for your love and support, it means so much to our family," Vanessa continued.

Nick, 41, previously told People, "I can't imagine loving a child more than I love my son, so I guess it's just gonna be a different kind of love."

Nick and Vanessa wed in a July 2011 ceremony that was later broadcast as a wedding special on TLC. The pair began dating in 2006 and got engaged in November 2010 following a brief breakup in 2009.

In addition to their The Sing-Off and Wipeout credits, both have other reality ties. Nick starred in Newlyweds: Nick & Jessica with former wife Jessica Simpson, while Vanessa -- who dropped her Minnillo name and took Lachey once married -- served as the host of ABC's True Beauty. Nick had also competed on Stars Earn Stripes.