The week in celebrity style: See who made our best-dressed list

January 15, 2015: Alexa Chung attended the ‘Alexa Chung for AG’ launch party in London in a leggy ensemble that featured a buttoned-up denim dress, sparkly tights and black leather boots.

January 14, 2015: Lily Collins visited Extra at Universal Studios in a heavily printed dress by Rachel Zoe from the Pre-Fall 2015 dress. The actress completed her look with black pumps by Casadei.

January 13, 2015: Julianne Moore hung up her evening gowns for a white asymmetrical jumpsuit by Alexander McQueen for the New York screening of Still Alice. The actress accessorized with a black clutch by the same British designer label and Fred Leighton jewels.

January 13, 2015: Kristen Stewart worked a daring outfit by Roksanda from the Spring 2015 collection at the New York screening of Still Alice. Her outfit consisted of a sheer black and blue silk dress, which she styled with a mini Wolford skirt and an eye-catching neon pink belt. She topped off her outfit with strappy heeled-sandals by Barbara Bui.

January 13, 2015: At the Still Alice New York screening, Kate Bosworth worked a high-glamour look by Oscar de la Renta. Continuing the Swarovski-crystal embellished neckline in the Spring 2015 backless dress, the actress accessorized with metallic Jimmy Choo heels, a Rauwolf clutch and H. Stern jewels.

January 13, 2015: Bella Thorne wore a blush-pink, lace dress by Blumarine from the Spring 2015 collection at ELLE‘s Annual Women in Television Celebration. She topped of her looking with matching platform pumps by Christian Louboutin.

January 13, 2015: For ELLE‘s Annual Women in Television Celebration, Girls Lena Dunham went for a complete Prada look, which included a black and pink floral dress from the Resort 2015 collection and navy pumps featuring a sparkly trimming. She topped off her girly outfit with Irene Neuwirth jewellery.

January 13, 2015: Sarah Hyland opted for a head-to-toe white ensemble at ELLE‘s Annual Women in Television Celebration that consisted of a cut-out, neoprene dress by DKNY from the Spring 2015 collection and an Edie Parker clutch.

January 13, 2015: For her visit on The Tonight Show Starring Jimmy Fallon, Brit girl Sienna Miller donned a striped knit dress by Céline and kept her accessories simple with black Pierre Hardy sandals and Jennifer Fisher jewellery.

January 13, 2015: Jennifer Lopez turned up the heat in two-piece ensemble by David Koma at the Miami screening of The Boy Next Door. The singer/actress teamed her black and blue cut-out bra and paneled skirt, which features a sheer insert with heels by Casadei and jewellery by Norman Silverman.