Julianne Hough
A regular city of stars turned out for the bash.
The former "Dancing with the Stars" pro is ready to shake things up.
WHAT'S HAPPENING
We're kind of obsessed with this.
[Insert Ryan Seacrest joke here.]
And Aaron Tveit is hopelessly devoted to Julianne Hough.
The ladies basked in the sun on the beaches of Mexico.
Va-va-voom ... and then some.