Mandy Moore shows her support for 'sensational bud' Hilary Duff at her final tour show following Ashley Tisdale's 'toxic' mom group drama

Hilary Duff was supported by Mandy Moore and her fellow mom group pals at her tour show on Thursday, amid their 'toxic mom group' feud with Ashley Tisdale.

Ashley, 40, sparked a frenzy last month when she wrote a scathing essay for The Cut, detailing her fallout with a group of Hollywood moms she was once friends with.

While the actress never identified any of the women, fans were convinced she was taking aim at Hilary's mom crew with fellow stars Mandy, 41, and Meghan Trainor. 

And this week, Mandy showed her support for her pal as she attended Hilary's final show on her Small Rooms, Big Nerves tour at The Wiltern in Los Angeles.

She took to her Instagram Story to heap praise on the singer, 38, as she shared a slew of clips of her performing on stage and their husbands, Matthew Koma and  Taylor Dawes Goldsmith dancing in the crowd.

Gushing over her pal, Mandy wrote: 'Broke my brick time to say that my bud is a sensational icon queen, giving us all what we needed. You are forever a superstar, @hilaryduff!!!!'

Two more of the high-profile mom-group, Janice Lee and Gaby Dalkin, were also in attendance to support Hilary, according to People.

Mandy - who shares sons Gus, four, Oscar, three, and 16-month-old daughter Louise with husband Taylor - has been close friends with Hilary for years.

The two woman became close after welcoming babies in 2021, with Mandy previously telling InStyle: 'Hilary is the coolest and she is a super-mom. She and Matt have become really close friends with my husband and I.

'They have a kid who’s six weeks younger than [my son] Gus. And so, we had babies at the same time.'

While she revealed how the Lizzie Maguire star had created their mom group, recalling: '[Hilary], being the super-mom that she is, formed a cool mom club.

'Somehow, I got invited into it, and it’s the best. I’ve made so many wonderful friends. We all just gathered earlier this week and had dinner and we have baby classes together and it’s incredible.

'I’m very, very grateful to have those resources and just incredible women to be able to lean on. We’re all kind of going through this chapter of our lives together.'

However, the group became embroiled in drama this year, after Ashley published her essay Breaking Up With My Toxic Mom Group in The Cut and made a splash around social media.

In the article - which was an elaboration on a blog post she shared in November - she wrote that the other women began to get together without inviting her, leaving her to find evidence of the 'group hangs' on Instagram afterwards.

She clarified that she 'never considered the moms to be bad people (maybe one),' but that 'our group dynamic stopped being healthy and positive - for me anyway.' 

One particular gathering that she was left out of proved to be the final straw for Ashley, who sent the group a text announcing her exit that read: 'This is too high school for me and I don't want to take part in it anymore'.

The essay sparked huge reaction and backlash towards Ashley on social media, and a whirlwind of conjecture about who she might be referring to.

Pouring fuel on the fire, the High School Musical star unfollowed both Mandy and Hilary on Instagram shortly before the piece was published.

Hilary's husband Matthew responded by posting a parody mock-up of a Cut headline that read: 'A Mom Group Tell All Through A Father's Eyes: When You’re The Most Self Obsessed Tone Deaf Person On Earth, Other Moms Tend To Shift Focus To Their Actual Toddlers.'

Hours later, Mandy posted to social media calling Matthew 'one of the most talented and generous humans I’m lucky to know,' pointing out that he 'literally gave my family a place to stay one year ago today when we evacuated' - referencing when she lost her home in the California wildwire.

A source close to Mandy and Hilary told Us Weekly the group of moms had been 'hurt' by Ashley's public attack on the group.

The insider said: 'They all feel blindsided and hurt by Ashley speaking out the way she did.

'From their perspective, they believed the group was supportive and coming from a good place, and they never thought there was any bad intent behind how things played out.

'The moms insist there was no ‘mean girl’ behavior and say they were genuinely trying to be there for one another during a really vulnerable time in all of their lives.'

Ashley had previously praised her 'village of moms' after her first daughter, Jupiter, four, was born in 2021.

The following year she effused about a weekend getaway with Hilary and Meghan, writing: 'What an amazing group of women to journey through this mom-hood together!'

And last January she waxed rhapsodic about how her 'mom group' rallied around each other amid the LA wildfires, writing: 'The amount of people checking in with each other is so amazing', while tagging friends including Mandy, Hilary and Meghan.

'You realize in dark moments you have each other. The human connection is not lost. Shout out to the mom group that’s there in the highs and the lows.' 

Rumours have been circulating about why Ashley might have been frozen out of the group - with one strain of speculation saying the break could have resulted from her social media posts about Charlie Kirk's assassination last September.

She had contrasted the reactions to the murder with the response to 9/11, writing: 'Where we once were united and grieving together as a country, today we see someone die and blame his politics and opinions. 

'Everyone in that building had different views and opinions, when we stop caring about loss of life we are done.'

Her post was met with outrage online, prompting her to fire back in her defense: 'It shouldn’t be controversial to say this, but even when we disagree or find someone’s views offensive, violence is never the answer.'

Ashley noted that she was 'for equal rights for everyone - women’s rights, voting rights, LGBTQ+ rights,' as well as for gun control and 'reproductive rights.'

She appeared to be delineating a divide between her views and those of the late Kirk, a Christian conservative who was firmly opposed to abortion, gay marriage and various trans causes as well as being a fierce advocate of gun rights. 

However one source has responded to the conjecture about Tisdale's isolation from the group by saying: 'It's a myriad of things, not just one specific,' via Page Six.

An insider told PEOPLE about the drama: 'It was a misalignment of values that Ashley decided to make public. Friends naturally drift apart. It didn't warrant a dramatic breakup text.'