This certainly made us laugh!
While on The Tonight Show, Jimmy Fallon made Zac Efron and Seth Rogen promote their new film Neighbors dressed as teenage girls, dancing.
Yup! Fallon in a segment hosts a 'Teen Nick' show in which Seth and Zac deemed mutual friend James Franco totally "ew" during the segment, before dancing to Lil Jon.
Watch the full clip above and tell us what you think.