It's not clear whether Niall was just popping in to say hello or if he could possibly be recording some vocals for Miley's upcoming album but only time will tell.
Miley confirmed that it was Niall in the picture she posted up as she tweeted:
Ok so in case you didn't notice . Yes that is Niall. ☺☺☺— Miley Ray Cyrus (@MileyCyrus) April 3, 2013
Miley's made no secret about the fact she's a big One Direction fan when she revealed she has a crush on Zayn Malik.
Do you think a Miley and Niall duet would be worth a listen?
DISNEY GIRLS GONE BAD: FROM BRITNEY SPEARS TO MILEY CYRUS
ONE DIRECTION PREPARING TO SPLIT?
KATIE PRICE UPSET PETER ANDRE AT HER WEDDING TO KIERAN HAYLER