Jessica Simpson's belly isn't the only thing that's swelling up these days!

The mommy-to-be took to Twitter on Sunday to share a pic of her sexy bee-stung lips, which she credits to her last trimester of pregnancy.

The former Newlyweds star, who's engaged to baby daddy/former NFL player Eric Johnson, Tweeted:

    "Woke up looking like the lip injection fairy visited me in the night! Is this how pregnancy face begins?! Yikes!."

Are bee-stung lips really something to pout about, Jess?

Simpson better enjoy her Anjelina Jolie-like lips now; they just might disappear when she gives birth in the spring!