They marked the last day of summer by ushering in a giving season.Paris and Nicky Hilton dusted off their favorite holiday threads for the 16th annual Christmas in September charity event on Tuesday night at The Abbey in West Hollywood.The 40-year-old socialite and her fashion designer sister, 37, rocked plaid ensembles to match their mom, Kathy, as the trio served as co-hosts of the soiree to benefit Children’s Hospital of Los Angeles .Tis the season: Paris and Nicky Hilton dusted off their favorite holiday threads for the 16th annual Christmas in September charity event on Tuesday at The Abbey in West Hollywood Paris sported a fiery red satin blouse with a khaki colored plaid mini skirt for the star-studded event in Los Angeles.She added inches to her statuesque frame with a pair of over-the-knee black suede boots, and carried a rainbow clutch to match sparkling fingerless gloves.Nicky opted for a blue-and-green tartan plaid dress with a chic collar and black velvet buttons.Giving back: The 40-year-old socialite and her fashion designer sister, 37, rocked plaid ensembles to match their mom, Kathy, as the trio served as co-hosts of the soiree to benefit Children’s Hospital of Los Angeles Festive: Paris sported a fiery red satin blouse with a khaki colored plaid mini skirt for the star-studded event in Los Angeles Christmas spirit: Nicky opted for a blue-and-green tartan plaid dress with a chic collar and black velvet buttons She wore her platinum blonde tresses partially tied back, with wispy fringe framing her face and highlighting a pair of striking emerald earings.

Kathy, who recently became a fan favorite after her first season of Real Housewives of Beverly Hills, looked lovely wearing a red-and-white plaid dress with a ‘Mrs.Claus’ purse to match.Her younger sister and former reality star, Kim Richards, received the family memo and wore a black-and-white check dress with black over-the-knee boots.Queen of the scene: Kathy, who recently became a fan favorite after her first season of Real Housewives of Beverly Hills, looked lovely wearing a red-and-white plaid dress with a ‘Mrs.Claus’ purse to match Helping hands: Her younger sister and former reality star, Kim Richards, received the family memo and wore a black-and-white check dress with black over-the-knee boots Beautiful: RHOBH co-star Garcelle Beauvais sported a slinky two-tone long-sleeve dress with a thigh-grazing slit RHOBH co-star Garcelle Beauvais sported a slinky two-tone long-sleeve dress with a thigh-grazing slit.Sponsored by Ketel One, the annual event ‘has become a West Hollywood tradition and helps solicit thousands of toys for Children’s Hospital Los Angeles during a time of the year when they need them most.’ ‘Founded in 1901, Children’s Hospital Los Angeles is the largest provider of care for children in Los Angeles County,’ a release said.’Families travel from all 50 states and more than 90 countries so that their children can receive the very best care.’ Good cause: Sponsored by Ketel One, the annual event ‘has become a West Hollywood tradition and helps solicit thousands of toys for Children’s Hospital Los Angeles during a time of the year when they need them most’ Strolling in: Paris, Nicky and their mother, Kathy, were seen staying close to each other as they made their way towards the event.