Paris Hilton & Chris Zylka Support Nicky Hilton at Clothing Line Launch Party!

Paris Hilton cozies up to fiance Chris Zylka as they attend the launch of her younger sister Nicky's new Nicky Hilton X Tolani New Mommy And Me Collection on Saturday afternoon (March 17) in Los Angeles.

The 37-year-old DJ and businesswoman looked summer ready in a purple dress, floppy hat, and sunglasses while carrying her pup Diamond.

PHOTOS: Check out the latest pics of Paris Hilton

You can check out Nicky's full collection at TolaniCollection.com.

FYI: Paris and Nicky are both wearing pieces from Nicky's Tolani collection.

10+ pictures inside of the stars at the launch event...