Brittany's back!

Heather Morris, who plays Brittany S. Pierce, showed off her slim post-baby body on "Glee's" 100th episode, flaunting her assets during a steamy rendition of Britney Spears' classic, "Toxic."

The new mom looked hotter than ever for the burlesque performance, sporting a red sequin push-up bra, black mini skirt, red plaid stockings and black leather boots.

Did we mention that this episode was shot just three months after she gave birth to baby Elijah!?

This sultry performance was just one highlight from last night's show!

The kids of McKinley High all came back to the Glee club classroom to reminisce about the good times with throwback tunes they've all sang before.

But while April (Kristin Chenoweth) and Holly (Gwyneth Paltrow) made appearances to try to help save the club from extinction, and Rachel Berry (Lea Michele) and Mercedes (Amber Riley) had a diva-off, it was Brittany and Santana (Naya Rivera) who really drew us in.

After the "Toxic" trio performed, the episode ended with a scene between the former lady loves. Santana sang "Valerie" to take her mind off of her ex-girlfriend, the ladies shared a kiss that brought up old memories. Brittany admitted Santana was the only person for her, as she subtly tried to get Santana to push her girlfriend Dani (Demi Lovato) out of her mind.

What did you think about Glee's 100th episode? Sound off below!

Click "Launch Gallery" below to see more celebrity post-baby bodies, before and after. 

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