Hilary Duff Stuns Fans with Fit New Look

fans were shocked by how toned she looks these days after welcoming four children.

The 38-year-old Lizzie McGuire actress was seen in a bra top and leggings as she posed in a gym.

The Hollywood veteran's arms and shoulders were very muscular as she flashed abs.

'When did Duff get so buff?' asked one fan on while another chimed in, 'Wouldn't want to make her mad in a dark alley, she could whoop my booty.'

Duff was posing for a new partnership with Ladder. 

'Are we ready to finally talk about the training plan? @joinladder #LadderPartner,' the blonde wrote in her Instagram caption for the ad.

'Having a plan on @joinladder keeps me consistent in the gym, no matter what my insane schedule looks like,' she said in a subsequent post.

'When I shifted to strength training, everything changed for me — how I feel, how I move, how I perform in every area of my life. Being able to carry my kids and give my best on stage, all while feeling confident in my body, is everything.

'I've never felt so confident and so strong, and that confidence makes all the difference. I'm Hilary Duff, and I train on Ladder.'

Ladder has 400,000 users worldwide, and around 80 percent of them are female.

Also this week the actress was seen at the TIME 100 event in New York City.

She wore a strapless top and matching slacks as she took to the stage after posing with her husband Matthew Koma. 

This comes after Duff was caught up in a scandal last year.

She said she 'felt used' after Ashley Tisdale's 'toxic mom group' essay.

The actress and singer has broken her silence after the High School Musical star called out 'mean-girl behavior' in a piece for The Cut about cutting ties with her friends last year.

Although Duff had nothing she wanted to clarify regarding the essay, she told the Call Her Daddy podcast: 'I think it came at like the craziest time where I was, like … the timing felt not great, and I felt used.'

She was in the process of her musical comeback, which saw her drop Luck... Or Something - her first album in over 10 years - earlier this month.

In her essay last month, Tisdale wrote about 'breaking up' with a group of mom friends, which fans quickly speculated included fellow former Disney Channel star Hilary.

She quipped: 'I don't really think people had to connect very many dots, do you?'

The actress felt 'really sad' and 'taken aback' by the article, and she insisted the claims in the piece weren't accurate.

She added: 'Motherhood has brought on, like — I have my core group of friends who have been my ride or die for 20 years, 10 to 20 years, and I have tons of different groups of mom friends because I have four kids, you know?

'So, I think I just was like, 'Whoa.' It sucks to read something that's not true, and it sucks on behalf of, like, six women and all of their lives.'

Tisdale first discussed leaving her 'toxic' group of mom friends in a blog post.

She said: 'Here's the thing nobody prepared me for: Mom groups can turn toxic.

'Not because the moms themselves are toxic people, but because the dynamic shifts into an ugly place with mean-girl behavior. I know this from personal experience.'

Tisdale explained there were group text chains that 'didn't include everyone' and there were 'hangouts' she didn't get invited to.

In her essay for The Cut, she went on to open up about how she started to feel 'excluded', writing: 'I was certain that I'd found my village.

'But over time, I began to wonder whether that was really true. I remember being left out of a couple of group hangs, and I knew about them because Instagram made sure it fed me every single photo and Instagram Story.

'Another time, at one of the mom's dinner parties, I realized where I sat with her - which was at the end of the table, far from the rest of the women. 

'I was starting to feel frozen out of the group, noticing every way that they seemed to exclude me.'