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(USA Today) -- Jessica Simpson proved that baby bumps look great in bikinis when she posted a revealing Twitter pic Sunday.

The pregnant star, who is already mom to 7-month-old daughter Maxwell, announced last week that she and fiance Eric Johnson are expecting their second child.

"Bumpin' and Proud!" she captioned the photo, which she took presumably while on vacation with her family in Hawaii over the holidays.

Story by: Arienne Thompson, USA TODAY

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