Congrats to Mariah, 42, and Nick, 30, who just welcomed their first daughter and son, born at 12:07 p.m. PT in Los Angeles. The baby girl was born first, weighing in a 5 pounds, 3 ounces; the boy is 5 pounds 6 ounces. Names have not yet been released.

Nick Cannon Tweeted his joy: "My wife just gave me the most incredible anniversary gift ever in life!"