On Wednesdays, Lindsay Lohan still wears pink.

The Mean Girls star was beaming as she attended the Caudwell Children's Butterfly Ball in London Wednesday, making her red carpet debut with her boyfriend, Egor Tarabasov. Flashing a sparkler on her ring finger, Lohan was all smiles as she posed with her hand on her hip in a plunging, pastel pink gown with a beaded bodice.

The 29-year-old actress completed her look with dangling diamond earrings, a soft pink lip and natural makeup. She also kept her hair simple—long and flowing in soft waves—which allowed her dress to be the star of the show. Tarabasov was right at her side, wrapping his arm around her in a black 3-piece suit.

Since Lohan was rocking pink on a Wednesday, she couldn't help but pay tribute to her Mean Girls roots. "#onwednesdayswewearpink," she captioned a photo of herself and Tarabasov at the event on Instagram, adding, "#butterflyball2016 @clairelcaudwell and @johncaudwell thank you for including us to support all of the work you do for children bless you."

In the photo, Lohan stuns as she smizes at the camera with Tarabasov closely at her side. The duo seemed to have a blast at the charitable event, which raises money to help thousands of disabled children in the UK and their families.