Seth Rogen and Zac Efron hit Hollywood to premiere their new comedy Neighbors, and the big buzz on the carpet was whether or not he's dating his co-star, Halston Sage!
ET's Brooke Anderson was on the red carpet with the stars to find out if indeed Zac and Halston have been getting cozy, and you'll be quite amused when you see Halston's reaction after being asked about it point blank!
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Rose Byrne, Christopher Mintz-Plasse, Dave Franco, Ike Barinholtz and Jerrod Carmichael also star in the outrageous comedy about a young couple suffering (Rogen and Byrne) from arrested development who are forced to live next to a fraternity house after the birth of their newborn baby.
Directed by Nick Stoller (Forgetting Sarah Marshall, Get Him to the Greek), Neighbors moves into theaters May 9.