Safe Haven star Hough and the American Idol host have ended their romance after two years of dating and are no longer living together.
A source tells UsMagazine.com the relationship suffered due to their gruelling work schedules.
The insider explains, "Honestly, their schedules were too hectic. It just got to be too much. I think they both just sort of knew they couldn't do it anymore. The travel and lifestyle got to be too much. Who knows if this is just for now, but I think this is for good."
Neither star has commented on the rumours, but on Friday (15Mar13) Hough tweeted a photo of the inspirational motto "It gets better!"
The break-up caps off a rough few days for Hough - the blonde beauty was the victim of thieves last Friday (08Mar13) when $100,000 (£62,500) worth of jewellery was stolen from her car. She was then left with swollen "chipmunk cheeks and Botox looking lips" after root canal surgery.