Julianne Hough has become a household name. Ever since she joined the cast of Dancing with the Stars back in 2007, we've been infatuated by the blond-haired, blue-eyed beauty. 

Aside from being insanely fit, she's a thriple threat: Hough's also a phenomenal singer and actress.

Currently, she writes a lifestyle blog where she shares her top fitness tips (among other things); is working on an original series for Starz called Blackpool, which takes place in the world of competitive ballroom dancing; and collaborates with fitness apparel line MPG Sport.

Click through for some of this fit star's hottest Instagram photos.