Britney’s Bump Balloons Fast: Are Twins On The Way?

Is Britney Spears sporting a new supersized body these days because she's eating for more than two? Sources close to Spears, 23, say the pop princess' hefty weight gain in rapid time could mean she's expecting two little Federlines this fall.

"Britney is only supposed to be five months along," says a source, "but she already looks like she's gained nearly all the weight she is supposed to have throughout her pregnancy."

Further fueling suspicion, Britney seems to be waffling about the baby's sex.

"Lately, they've been reluctant to talk about whether Brit might be expecting a boy or a girl," says the source. "Instead, they cryptically give the answer that she's expecting a boy one week, and a girl the next."

Another clue is that Britney's been seen shopping for both girls and boys clothes. "Kevin [who's already got two kids with Shar Jackson] would probably freak over double duty," another source laughs, "but Britney would be over the moon!"