Published Friday, 20 December 2013
The Sports Illustrated beauty was first linked to Chmerkovskiy in June, but the reality TV star didn't confirm the relationship until October, when he admitted that their friendship had turned romantic.
However, according to editors at UsMagazine.com, the spark has since fizzled out and they recently parted ways.
A source said: "They are really good friends still and speak all the time, but their schedules just made it too difficult and it fell apart.
"(Chmerkovskiy) has a lot of respect for her, but it just wasn't working anymore."