InStyle party: Paris Hilton, Jennifer Hudson, Ivanka Trump

Jennifer Hudson attends InStyle Magazine's 20th Anniversary Party at Diamond Horseshoe at the Paramount Hotel. (AP)

Abigail Breslin attends InStyle Magazine's 20th Anniversary Party at Diamond Horseshoe at the Paramount Hotel. (AP)

Ivanka Trump attends InStyle Magazine's 20th Anniversary Party at Diamond Horseshoe at the Paramount Hotel. (AP)

Alessandra Ambrosio attends InStyle Magazine's 20th Anniversary Party at Diamond Horseshoe at the Paramount Hotel. (AP)

Diane Kruger attends InStyle Magazine's 20th Anniversary Party at Diamond Horseshoe at the Paramount Hotel. (AP)

Nicky Hilton attends InStyle Magazine's 20th Anniversary Party at Diamond Horseshoe at the Paramount Hotel. (AP)

Paris Hilton attends InStyle Magazine's 20th Anniversary Party at Diamond Horseshoe at the Paramount Hotel. (AP)

Paris Hilton, Alice + Olivia designer Stacey Bendet and Nicky Hilton attend InStyle Magazine's 20th Anniversary Party at Diamond Horseshoe at the Paramount Hotel. (AP)