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Key Points McKenna Grace stunned in an elegant champagne gown at the Regretting You premiere. Rumors swirl about Grace and co-star Mason Thames' possible off-screen romance. Regretting You, also starring Thames and others, releases in theaters October 24. McKenna Grace looked so grown up during her latest red carpet appearance. On Monday, Oct. 20, the 19-year-old actress and former child star attended the Los Angeles premiere for the new movie Regretting You, where she put on an elegant display in a stylish and sophisticated ensemble. 🎬SIGN UP for Parade’s Daily newsletter to get the latest pop culture news & celebrity interviews delivered right to your inbox McKenna Grace Steps Out in Elegant Champagne Gown for Regretting You Premiere The Young Sheldon alum tapped into old Hollywood glamour on Monday night as she walked the red carpet in a stunning floor-length champagne gown with a long, dramatic train that flowed behind her. The dress, which also featured a plunging neckline and a thigh-high slit, was paired with a dazzling pair of metallic high heels to polish off the classic look. For the evening’s glam, Grace leaned into a timeless style for both her hair and makeup. Her blonde hair was styled into soft, voluminous curls, reminiscent of classic old Hollywood style, while her makeup was dewy and understated. The Gifted actress also sported a pair of sparkling diamond earrings to add a little extra glitz to the demure ensemble. Grace plays the role of Clara in Regretting You, a movie adaptation of Colleen Hoover‘s novel of the same title. The film also stars Mason Thames, Allison Williams, Scott Eastwood, Dave Franco, Willa Fitzgerald and Sam Morelos, all of whom were in attendance for Monday night’s premiere as well. Are McKenna Grace and Mason Thames Dating in Real Life? Grace and Thames play love interests in the new romance film, but questions about their off-screen relationship have also been piling up. Back in April, the pair sent fans into a frenzy when they shared a passionate kiss in a TikTok video, but it wasn’t clear if the video was actually a relationship hard-launch, or if the two co-stars were just really committed to promoting the new film. Oops! We’re unable to load this content right now. View directly on TikTok The two actors only added fuel to the fire when they stepped out in public together on more than one occasion, including an appearance at an NBA game later that same month. In May, Thames was featured in one of Grace’s Instagram photo dumps, which included one particularly cozy shot shot of the actor leaning his head on Grace’s waist while she rested her arm around his head. They were also spotted holding hands while walking through New York City back in June. Grace and Thames have also made a number of appearances together as part of the press tour for their new film together, but neither of the actors has confirmed an off-camera romance just yet.