'X Factor' runners up Fifth Harmony delivered yet another butter smooth cover. Following renditions of One Direction's 'They Don't Know About Us' and Ed Sheeran's 'Lego House,' the quintet of lil' ladies tackled another ballad, this time by a female superstar instead: Rihanna!

Accompanied only by an acoustic guitar, the gals harmonized (of course) 'Stay,' adding in "ah-ooh" touches to back each member's solos during the verses. Their cover is ever-so-slightly more uptempo than the original, giving it a more upbeat feel while maintaining the raw emotion that's the song's signature.

Based on the intensity and success of 5H's covers, the anticipation for their original material is mounting -- and with voices like theirs, the girls are pretty much guaranteed to deliver. Watch your back, RiRi!