Hilton, 37, was all smiles as she landed at Melbourne International Airport following a trip to Dubai.
The blonde hotel heiress is in Australia for the launch of her new fragrance, Platinum Rush.
Posting a series of clips on her Instagram page, Hilton looked casual in black velour tracksuit.
Her arrival followed shocking claims that her ex has demanded she returns her $2.75 million engagement ring - despite Zylka not buying it.
The New York Post claim that it was given to Hilton, who is worth $413 million, for free from celebrity jeweller Michael Greene.
“The ring is hers,” says a source close to the couple.
After nearly two years together, sources have confirmed to multiple news outlets that the pair have parted ways.
“Paris broke up with Chris a few weeks ago,” an insider shared.
“Their relationship moved really quickly, and she realised he wasn’t right for her. She wishes him well and hopes they can remain friends.”