Kristin Cavallari's Belly 'Grew Double' Overnight
02/27/2012 AT 11:45 AM EST
"My stomach literally grew double overnight!!" the expectant reality star, 25, Tweeted Sunday. "This belly came out of nowhere!"
Cavallari got glam to host E!'s Academy Awards pre-show, wearing a strapless gray gathered gown and nude Christian Louboutin heels.
She and fiancé Jay Cutler will welcome their first child in late summer.