Pregnant Kristin Cavallari: My Belly "Grew Double Overnight!"

The reality star, who announced in January that she was expecting, says that her baby bump is growing at an exponential rate

Kristin Cavallari's baby bump is growing -- and at an exponential rate!

The recently engaged 25-year-old reality star announced her pregnancy last month, and now she's excited to have enough of a belly to show off.

"My stomach literally grew double overnight!!" Cavallari tweeted Sunday. "This belly came out of nowhere!"

We expected Cavallari to be massive with a tweet like that, but the fiancee of Chicago Bears quarterback Jay Cutler still looked slim and chic when she hosted E!'s Academy Awards pre-show Sunday night. She worked the red carpet wearing a strapless gray gathered gown and nude Christian Louboutin heels, and seemingly glowed with happiness.

Cavallari and Cutler are expecting their first child in late summer and are also planning a wedding. But Kristin better not bank on Jay helping with the nuptial preparations.

"I don't really make a lot of (wedding) decisions," Cutler, 28, said in a radio interview in December. "I hear about them in passing or if I have to possibly write a check or something like that, but other than that, whatever she wants to do, I'm on board."

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