Heidi Montag reveals it took time to warm up to new The Hills co-star Mischa Barton: 'It was a little frustrating for me at first'

Mischa Barton didn't click with everybody right away on The Hills: New Beginnings.

Heidi Montag talked about her first impressions of her new co-star, who joined the cast of the reboot this year, and revealed she was initially put-off by Mischa's 'reserved' personality. 

'I think it was a little frustrating for me at first, because, like, we've put our whole lives into this show before and after, so to have someone come in and, like, be so reserved was a little bit frustrating,' Montag, 33, told Us Weekly earlier this month. 

Reserved: According to Us Weekly, Barton, 33, has an 'aloof' personality that has put fellow cast members off
Frustrated: Montag (pictured) expressed that it was frustrating to work alongside Mischa because of her reserved personality

Making it work: Heidi Montag wasn't initially the biggest fan of MTV's decision to cast OC alum Mischa Barton on The Hills: New Beginnings. Here they are at the LA premiere of The Hills: New Beginnings on Wednesday 

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Montag, 32, did end up giving her costar the benefit of the doubt, however. 

'I don't think it was intentional, I think that is, like, how she is, and she's just a little more closed and needed a little more time to open,' she admitted.

Cast member and Hills alum Jason Wahler saw a different side of Barton that he says took time to build. 

Throwback: Barton posed with Tate Donovan, Rachel Bilson, Melinda Clarke, Peter Gallagher, Kelly Rowan, Chris Carmack, Benjamin McKenzie and Adam Brody for a The OC promotional photo back in 2004

Throwback: Barton posed with Tate Donovan, Rachel Bilson, Melinda Clarke, Peter Gallagher, Kelly Rowan, Chris Carmack, Benjamin McKenzie and Adam Brody for a The OC promotional photo back in 2004

Nostalgia: Heidi Montag (left) starred in The Hills from 2006-2010 alongside now-husband Spencer Pratt, as seen in this screengrab

Nostalgia: Heidi Montag (left) starred in The Hills from 2006-2010 alongside now-husband Spencer Pratt, as seen in this screengrab 

Starting over: The cast of the Hills: New Beginnings posed together at the show's LA premiere on Wednesday. Pictured are Justin Bobby Brescia, Jennifer Delgado, Frankie Delgado, Brody Jenner, Kaitlynn Carter Jenner, Jason Wahler, Ashley Wahler, Brandon Thomas Lee, Audrina Patridge, Whitney Port, Mischa Barton, Stephanie Pratt and singer Natasha Bedingfield

Starting over: The cast of the Hills: New Beginnings posed together at the show's LA premiere on Wednesday. Pictured are Justin Bobby Brescia, Jennifer Delgado, Frankie Delgado, Brody Jenner, Kaitlynn Carter Jenner, Jason Wahler, Ashley Wahler, Brandon Thomas Lee, Audrina Patridge, Whitney Port, Mischa Barton, Stephanie Pratt and singer Natasha Bedingfield

'She was very sheltered in the beginning. Very sheltered and shy and I think as I've gotten to know her … she was definitely ...' Wahler began. 

'... Misunderstood,' his wife Ashley Wahler interjected.

'I feel like she's, like, a little timid and not as, like, open as the rest of us, but then as soon as you hang out with her she becomes more real and raw,' Ashley, who is part of the cast as well, explained.

Fresh: Barton looked glamorous in the opening credits for The Hills: New Beginnings

Fresh: Barton looked glamorous in the opening credits for The Hills: New Beginnings 

Frankie Delgado gave Barton some props for even trying. 

'What we do is really hard to do and I think that she kind of proved it right,' the Hills alum said.

'Like, she was like, "Yo, listen, this is the hardest thing I've done."

Glowing: Montag went for her usual glamour in the opening credits for The Hills: New Beginnings

Glowing: Montag went for her usual glamour in the opening credits for The Hills: New Beginnings

'You gotta put yourself out there… People can spot that fakeness,' he added.

It might have taken time for Barton to adjust, but now that she has, she's earned rave reviews from Montag and others.

'I think she’s really quirky and funny and… she’s a great addition to the cast. I really like Mischa,' Montag said.

'I love Mischa, I have a great time with her,' Ashley said in agreement. 

The Hills: New Beginnings premieres on MTV at 10 p.m. EST on Monday, June 24, 2019. 

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Heidi Montag reveals it took time to warm up to new The Hills co-star Mischa Barton

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