Is Jessica Simpson expecting?

Jessica Simpson's growing bust size has pals wondering whether she's pregnant with on-again, off-again beau John Mayer's baby.

A pal revealed to the National Enquirer that Simpson's breasts had grown so huge in such a short time that her friends were wondering whether the stork will soon be paying her a visit.

"Her friends are astounded at how huge Jessica's breasts have gotten, and are asking each other if she could be pregnant," the National Ledger quoted the pal, as telling the tabloid.

Another reason why pals also think that Simpson is pregnant, is because not only has she been taking care of herself, but also because she refuses to confirm or deny the reports.

"Her breasts are positively huge, and she really seems to be taking care of herself," the pal said.

"She's not saying anything one way or the other when the subject comes up, but women who put on weight don’t smile when someone suggests they might be pregnant," added the source.

However, Jessica Simpson's publicist denies that she is expecting.

The singer recently confirmed that she had split from beau John Mayer. But friends believe that they just might be getting back together, given the number of times they have broken up and made-up.