Rachel Bloom is a total teenage dream!
Donning a marching band outfit, the 29-year-old actress embraces her teenage self -- zits and all! -- performing the catchy tune to the delight of co-hosts LL Cool J and Chrissy Teigen.
This isn’t the first time “Teenage Dream” has been used on the show. Back in 2013, John Krasinski performed the song in one of the first segments of Lip Sync Battle when Fallon was still hosting Late Night.
Lip Sync Battle
airs Thursdays at 10 p.m. ET/PT on Spike.
Earlier this year, Christina Aguilera crashed Hayden Panettiere's amazing Lip Sync Battle performance
. Watch the video below.