Lindsay Lohan has made her first public appearance since she reportedly became engaged to Russian boyfriend Egor Tarabasov.

The 29-year-old actress attended a private screening of Disney sequel Alice Through the Looking Glass at London's Bulgari Hotel on Thursday (26May16) with shipping heir Egor Tarabasov.

The Mean Girls star wore a black and white Temperley London dress with black platform sneakers, while Egor rocked the casual look with a white T-shirt and denim jacket. Lindsay also posed for photos with her beau, alongside fashion designer Alice Temperley, who designed her outfit.

Earlier on Thursday, the pair had celebrated Egor's 23rd birthday with a glamorous lunch in the capital. "Rushing around from work to lunch to work and fittings but still smiling!!" she captioned a shot of the pair driving around in a car.

Despite dating since last year (15), the couple have never officially announced their engagement. Lindsay later sported a diamond ring on her hand in April (16) at a Duran Duran concert in Brooklyn, New York, the same day that Entertainment Tonight reported the engagement news.

The actress was joined by Egor, her parents Dina and Michael, and sister Ali, who cheered from the audience as Lindsay took to the stage to sing Danceophobia with frontman Simon Le Bon.

Her father, Michael Lohan, later seemingly confirmed the couple is set to walk down the aisle. "Let me put it this way: is she wearing a ring on her finger?" he asked during an appearance on talk show Access Hollywood Live on Friday (29Apr16). When co-hosts Kit Hoover and Billy Bush replied, "Yes", he responded, "Then is that indicative of an engagement?".

Billy then pushed Michael for a "yes or no", prompting the proud dad to say, "From what I understand as a father, yes she is engaged."