Mandy Moore reveals which well-known Hollywood actor introduced her to 'underage drinking' when she was 18

Mandy Moore has name dropped the former child star who introduced her to her first cocktail.

While appearing on Evan Ross Katz's podcast Shut Up Evan on Thursday, the 42-year-old actress – who has responded to Ashley Tisdale's 'toxic' mom group essay – revealed her Saved co-star Macaulay Culkin got her into underage drinking.

She was 18 years old while filming the 2004 teen comedy in Vancouver, Canada, where the drinking age is 19. The Brian Dannelly-directed movie is about a group of teenagers at a Christian high school.

'I do remember a little bit of underage drinking,' Moore recalled. 'As it happened, I was like, "Look, I didn’t go to high school." I was 18.'

Culkin, now 45, was the oldest in the cast that included Jena Malone, Patrick Fugit and Eva Amurri.

After he acquainted the group with White Russians, Moore said: 'I was like, "Milk and alcohol? This was made for me. I love this! This is like ice cream, this is fantastic!"'

Daily Mail has reached out to reps for Moore and Culkin for comment. 

Despite experimenting with alcohol while underage, the entertainer said the castmates were an 'innocent' bunch.

'I distinctly remember the sweet, innocent – like, we would take giant marshmallows and throw them at people off the balcony,' she shared. 'We were kids! We weren’t really getting up to no good.'

Saved followed Moore's previous movies, 2001's Princess Diaries and 2002's A Walk to Remember.

She compared making the films to a 'summer camp' experience.

'The fact that I’d had so much fun doing both of those films, namely Princess Diaries, because it was with a lot of other young people – I was like, oh, this is like summer camp!' she enthused.

The pop star-turned-actress detailed, 'I felt like a cool kid. I was like, oh, I get to sit at the cool kids table with these young Hollywood kids that are making really cool choices, and they’re a part of really great films.'

And she called making Saved a 'crazy, crazy life-changing experience.'

Moore played the supporting role of Hilary Faye, the best friend of the film’s protagonist Mary (Malone). 

Mary attempts to 'save' her boyfriend from being gay, but ends up getting pregnant.

Moore gushed, 'I just loved the script and the character, and I thought it was really irreverent and funny, and also like, gonna move the needle.'

She said she hoped it would 'open up a door to other projects,' as audiences would get to see her 'in a different light.'

Moore has gone on to have an illustrious acting career, starring in the successful NBC drama This Is Us from 2016 to 2022.

Her role as the maternal figure Rebecca Pearson earned her a Golden Globe nomination for Best Supporting Actress in 2017 and an Emmy nomination for Outstanding Lead Actress in 2019.

The cast took home a SAG Award for Outstanding Performance by an Ensemble in a Drama Series in 2018 and 2019.