Julianne Hough attends Cosmopolitan's 50th Birthday Party held at the Ysabel Stock Photo - Alamy(00)

Julianne Hough attends Cosmopolitan's 50th Birthday Party held at the Ysabel Stock Photo - Alamy(00)

Image gallery: Julianne Hough Birthday

Julianne Hough attends Cosmopolitan's 50th Birthday Party held at the Ysabel Stock Photo - Alamy Julianne Hough arrives at Cosmopolitan magazine's 50th birthday celebration at Ysabel on Monday JULIANNE HOUGH at Cosmopolitan’s 50th Birthday Celebration in West Hollywood 10/12/2015 – HawtCelebs