Ryan Phillippe and Alexis Knapp
Wireimage; Globe Photos
03/17/2011 AT 01:20 PM EDT
's ex-girlfriend, Alexis Knapp, is pregnant – but she's not pressuring the actor to be involved with her unborn child.
"She has never asked Ryan for any help, nor does she expect it," a rep for Knapp tells PEOPLE.
According to a source, Knapp, who briefly dated Phillippe last summer, has told friends that she's expecting the actor's child
Another source says that Phillippe, 36, is awaiting the results of a paternity test
to determine if he's indeed the baby's father.
"Alexis has maintained her silence and will continue to do so," her rep adds. "Any 'source' claiming to have been her or her camp up to this point is false."
Adds the rep: "She continues to appreciate the love and support of her family and friends."
Knapp appears in two upcoming movies, Project X
this Thanksgiving and the Miley Cyrus
film So Undercover
, also due out in the fall.