Katie Holmes, Rooney Mara & Sienna Miller Get Glam for Cartier Fifth Avenue Grand Reopening!

Katie Holmes is gorgeous as she hits the red carpet at the Cartier Fifth Avenue Grand Reopening Celebration held as part of New York Fashion Week at the Cartier Mansion on (September 7) in New York City.

The 37-year-old actress was joined at the event by her mother Kathleen A. Stothers-Holmes, as well as Rooney Mara, Sienna Miller, Ruth Negga, Taylor Schilling, Edward Norton and his wife Shauna Robertson, Neil Patrick Harris and his partner David Burtka, Olivia Palermo and her husband Johannes Huebl, Lewis Hamilton, Jourdan Dunn, Mia Moretti, Katie Cassidy, Sofia Coppola and Hannah Bronfman.

Also in attendance as the musical guests for the evening was Ellie Goulding and Kacy Hill.

FYI: Lewis is wearing a Kenzo jacket.

40+ pictures inside of Katie Holmes, Rooney Mara and others at the Cartier party…