06/24/2008 at 09:55 PM EDT
Amy Jo Johnson, who played Keri Russell
's best friend Julie Emrich on the series Felicity
, is expecting her first child in late fall, a rep confirms to PEOPLE.
Johnson, 37, is shooting the new CBS show, Flashpoint
, while pregnant with her child with fiancé Olivier Giner. She stars as Jules Callaghan, a police sniper, in the show that premieres July 11.
A former gymnast, Johnson achieved fame with her first major television role as Kimberly Hart, the Pink Ranger, in 1993's Mighty Morphin' Power Rangers
She landed the role on Felicity
in 1998 and parlayed the exposure her singing and songwriting got on the show into the starring role for the film Sweetwater: A True Rock Story
, about the opening band at Woodstock.
Johnson has also recorded CDs of her own music in addition to acting in the ABC Family series Wildfire