What Tweethearts! Nick Cannon and Mariah Carey express baby joy on Twitter

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Mariah Carey and Nick Cannon aren't the only ones overjoyed by the arrival of their twins.

What's Mariah Carey going to do for her fifth wedding anniversary?

The 41-year-old singer gave birth to twins -- a healthy boy and girl -- on Saturday, which just so happened to be her and hubby Nick Cannon's fourth anniversary.

"My wife just gave me the most incredible anniversary gift ever in life!," the new dad tweeted soon after the birth. "I won't ever be able to top this!"

Cannon, 30, and Carey aren't the only ones excited about their double joy.

The babies are only a day old, but already they -- and their famous parents -- getting major love from some of the biggest names in the business.

Carey has been re-tweeting the well-wishes she's received -- and there are a lot.

"Congratulations Mariah & Nick!!!!!!!!!," wrote a clearly excited Nicki Minaj. "The twins have finally landed on earth!!! Yaaayyyyy!!!!! @MariahCarey mmmuuuuaaahhhh!!!!!!"

From Carey's longtime producer Jermaine Dupre: "CONGRATS!!! to Nick and @mariahcarey,on the birth of a baby girl and boy."

"Congrats Mr and Mrs Cannon on ur twin babies!!," wrote a member of the R&B group, Boyz II Men. "Look forward to sleepless nights for the next few weeks, trust me lol!"

Even fellow mommy-to-be Alyssa Milano sent the couple her love by re-tweeting their birth announcement and adding "Congrats!"

Carey popped at 12:07 pm on Saturday at an undisclosed hospital, her representative Cindi Berger confirmed.

While she and Cannon may be glamorous celebrities, the birth had its share of unexpected hiccups. Berger told the Associated Press that Cannon went to the wrong department of the hospital and had to be led to the maternity ward by a nurse.

"It was right out of an 'I Love Lucy' skit," she said.

The baby girl was born first, weighing 5 pounds 3 ounces, followed by her brother, who is 5 pounds, 6 ounces. Both babies don't have names just yet.

But proud papa Cannon promises, "They won't be crazy names like Carburetor or something."

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