Paris Hilton shared a series of throwback photos twinning with her sister Nicky on Monday, Oct. 7, to celebrate her sibling's 41st birthday.

To walk into my party seeing all of my friends, women I admire wearing the collection, looking so beautiful, seeing how everyone styles it so differently, it’s a dream come true.” Nicky and Paris Hilton Keep Fire and Ice Streak Going in Coordinating Holiday Party Dresses and More Looks From the Nicky Hilton for Rebecca Vallance Holiday Collection Party Robert Pattinson,

Nicky Hilton had more than one reason to celebrate on Saturday night. "I can't think of a better birthday," she said of celebrating her 41st at the Bel Air home of her parents, Kathy and Rick Hilton.

Paris pulled out all the stops with her rose gold balloons to celebrate her younger sister Paris Hilton is “sliving” for sister Nicky Hilton's 41st birthday! The “Stars Are Blind” singer, 43, showed off some decorations in an Instagram Stories video on Saturday,

Mytheresa hosted a cocktail party celebrating the launch of the Nicky Hilton for Rebecca Vallance Holiday Collection, held at the Bel Air residence of Rick and Kathy Hilton. The dress collection, marking Vallance's first collaboration with a design partner,