Former Playboy hottie Jenny McCarthy Tweeted a photo of her big, pregnant belly, revealing her baby weight of 211 lbs!

The one-time MTV hostess, 38, gave birth to son Evan back in 2002 and quickly dropped the pounds -- she was back to her 120-pound, 24-inch waist frame in no time. The MILF-y mom posted the pic to prove what many people didn't believe, writing:

    "For anyone who doubted my 211lbs at pregnancy here is a photo i found! Meaty meaty ass! Whoa!"

We had to see it to believe it!