Apparently the rumour was floating around online after an outlet suggested Miley dropped the pregnancy bombshell while filming a segment for the BET Hip Hop Awards, scheduled to air in October.
But an impending baby was definitely news to Miley!
The 20-year-old responded via Twitter yesterday, writing: "Waking up to the news that I'm now pregnant with Juicy J's baby…"
Former Hannah Montana star Miley later added: "Me: 'Did you know I'm pregnant with Juicy J's baby this morning?' @CheyneThomas: 'What are you gonna name it?' Me: 'Juicy J Jr. DUH."
We take that as a not true, then.
Miley announced her split from Hunger Games fiancé Liam Hemsworth in September. They'd been together since meeting on the set of 2009 romantic drama The Last Song.
Since then, she's been romantically linked to music producer Mike WiLL Made It, but his rep dismissed the speculation last week, saying the pair were simply working together on Miley's new album Bangerz.
Miley began streaming her fourth studio album yesterday. It features smash single 'We Can't Stop' and new effort 'Wrecking Ball', where she swings around naked on a wrecking ball in the accompanying video.
Watch Miley's video for 'Wrecking Ball' below (warning: she's naked!)