Mariah Carey & Nick Cannon Get Married Again (and Again!)

The lovebirds plan to tie the knot for the third time in order to celebrate their anniversary

On April 30, Mariah Carey, 40, will celebrate three years with husband Nick Cannon, 29. How will they mark the occasion? The way they always do: with a wedding. The couple is planning on throwing themselves a wedding party for the third year in a row, complete with vows, guests, and a new diamond ring for Carey. "We get married every year!" Cannon told Us Magazine. "That's our thing."

Actually, it's not just their thing; in recent years, many famous couples have raced each other to the altar to renew their vows. Why do celebs feel the need to get married more than once? Here are the four big reasons we've detected:

1.) They love parties.
Heidi Klum & Seal are about to celebrate five years together, and the couple's weddings get more fun with each anniversary. Last year, they dressed "down" and got married by Elvis; this year, all guests must dress as a bride or groom.  Conclusion: Heidi and Seal are fun, and we want to be their friends.

2.) They're trying to save their marriage.
Pink & Carey Hart renewed vows last April after a separation (during which she wrote the breakup anthem So What). David Duchovny & Tea Leoni also re-wed after a tough year (Duchovny, who'd been treated for sex addiction, even proposed again). Those couples are striving for a happy ending -- have they inspired Tiger Woods, who allegedly wants to renew his vows with Elin Nordegren?

3.) They're bored.
Jennifer Lopez & Marc Anthony. David & Victoria Beckham. Josh Duhamel & Fergie. What do all of these couples have in common? They're rich, they're beautiful, they're famous, and perhaps they just don't have anything better to do than plan weddings to congratulate themselves on not divorcing (like so many in the public eye).

4.) They were offered a free Hawaiian vacation for their entire brood by TLC.
Ahem.

So, let's talk turkey: Do these couples register for each new wedding? You have to wonder if Heidi and Seal's friends are getting tired of buying them more dishware.

Plus:
-
Heidi Klum's Love Secret? Get Married Every Year (to the Same Man!)
-
Nick Cannon Can't Wait to Have Kids with Mariah Carey
- PHOTOS: Star Snapshots: Couples Cam

What do you think about celebrities renewing their vows? Chime in below!

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