Just two weeks after getting engaged to Liam Hemsworth, Miley Cyrus was spotted hanging out at the pool at the Delano hotel in South Beach  Miami with a mystery man!

OK! GALLERY: MILEY CYRUS FLASHES HER ENGAGEMENT RING AT LAX

Word on the street is the stranger is none other than Miley's assistant, Cheyn Thomas, who chilled with both Miley and the 3.5-carat antique diamond ring she got from Liam.

As Miley lounged both in the water and poolside, she showed off her slim new figure. Miley is definitely growing up!

OK! GALLERY: MILEY CYRUS AND LIAM HEMSWORTH: CHECK OUT THEIR LOVE STORY FROM THE BEGINNING!

Do you think Liam has anything to worry about while he is busy filming Empire State in New Orleans?