Rockbandet Neon Trees gjorde en cover på Baby på Billboards hemsida.
"We tend to do more of a doo wop throwback vibe to a lot of our own songs, so we thought that Baby called for it" sa frontmannen Tyler Glenn. "We might as well cover something people are enjoying right now"

"And number two, he's a labelmate" sa trummisen Elaine Bradley "So we thought it would be kind of a nice shout out. Hello Justin Bieber!"

Justin svarade genom att Twittra "Shout out right back at you...thanks for the cover...it's great..."