Sienna Miller and married Balthazar Getty have been having a not so secret affair (ya, making out with Sienna while she's topless & then friends take pics, not so good) and now there are rumblings that the actress is pregnant with his love child.
More pics after the jump!

The 26-year-old was spotted leaving a Hollywood medical center, wearing a baggy shirt-dress and carrying an oversized bag (to hide the bump - albeit tiny), which of course has sparked the 'she's pregnant' rumors.
It's also been reported that the couple are shackin' up in L.A. as Balthazar wants to be near his children with HIS WIFE, designer Rosetta Millington. They have four kids - Cassius, 8, Grace, 7, Violet, 5, and June Catherine, almost one. Guess this means (if true), he'll be a dad of five.

Sienna's friends say she's not a homewrecker. Of course,she's not all to blame, Getty, has to take half. Both are homewreckers from what I can see.
[Source]
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