Paparazzi!: Katie O

Nope, she's not pregnant – she just plays it on TV! Katie Holmes dons a prosthetic baby bump as Jacqueline Kennedy on Monday while filming her History Channel miniseries, The Kennedys, in Ontario, Canada.

Katie Holmes to Play Jacqueline Kennedy

She's one of Hollywood's most famous faces, but Katie Holmes will soon be one of the country's most famous first ladies – at least on the small screen.

The actress has signed on to star in The Kennedys, an eight-hour mini series premiering in 2011 on the History Channel, as Jacqueline Kennedy, alongside Greg Kinnear, British actor Tom Wilkinson and Barry Pepper, the network said Wednesday.

Kinnear, who was most recently seen in The Last Song with Miley Cyrus, stars as President John F. Kennedy, while Pepper will play the role of Robert Kennedy. Wilkinson, who played Benjamin Franklin in 2008's John Adams, will portray Joe Kennedy Sr.