FOX musical dramedy 'Glee' is losing cast members faster than you can say “oh god, another mashup.” Hot off the heels of news that star Cory Monteith has checked himself into rehab, the world has now learned one of the show's other original cast members, Heather Morris, is pregnant.

The 26-year-old, who began her career as a backup dancer for Beyonce before she gained fame playing ditzy Britney S. Pierce (sound it out, people), is expecting her first child with her high school sweetheart, Taylor Hubbell.

A source confirmed this info to Us Weekly, saying Morris is three months along and just starting to show.

"It was totally unexpected, but they are incredibly happy and excited," the insider said. Which means either their contraception of choice failed, or they've joined the growing roster of celebs -- like Jessica Simpson and Kim Kardashian -- who don't seem to understand how these things happen.

Regardless, Morris hinted in 2011 that she wanted a family someday, even if it meant walking away from her career. "I want to marry Taylor and have kids with him," she said. "I love acting, but if it affects my relationship, then I won't continue."

No word yet on how (or if) 'Glee' will work her pregnancy into the storyline, but either way we're betting Coach Sylvester will not be pleased.