Katy Perry sings along to Taylor Swift hit Bad Blood inspired by their feud as she attends the first night of popstar's Sydney Eras Tour show with Rita Ora

Katy Perry and Taylor Swift have proved that their epic feud is well and truly in the past as they cuddled up for a selfie in Australia on Friday evening, following the singer's concert at Sydney's Accor Stadium.

Katy, 39, showed her support for her former frenemy, along with Rita Ora and her husband, Taika Waititi, and couldn't wait to pay tribute to her 'old friend' as she shared several snaps and videos on Instagram - including a super sweet close-up shot of them backstage together.

The two pop stars looked as glamorous as ever as Taylor, 34, pressed her cheek up against Katy's face and grinned from ear-to-ear ahead of her show-stopping performance, which saw her show off her svelte figure in a stunning sequin bodysuit.

Mother-of-one Katy, who looked chic in a pair of wide-legged pinstripe trousers and a matching cropped waistcoat, captioned the social media post, 'Got to see an old friend shine tonight,' and reassured fans that her friendship with the Shake It Off hitmaker is firmly back on track.

Katy Perry posted a sweet selfie with Taylor Swift after attending her concert in Sydney on Friday evening

Mother-of-one Katy watched Taylor's show from a VIP area with fellow singer Rita Ora

Rita and her husband, Taika Waititi, cozied up for a photo with a sequin-clad Taylor backstage

It's no secret that Katy and Taylor had a rather nasty falling out, with the latter even penning her 2015 song Bad Blood about their dispute - which began when Katy apparently tried to hire a bunch of Taylor's backup dancers and 'sabotage an entire arena tour.'

However, it seems Katy is now a fan of the song as she filmed video of Taylor performing the track and at one point, turned the camera on herself as she sang some of the lyrics which include: 'Now we got problems, and I don't think we can solve 'em, you made a really deep cut and baby now we've got bad blood.'

Katy, who wore her long dark hair down straight and completed her look with plenty of silver jewelry, watched Taylor's performance from a VIP tent alongside Rita, 33, and her filmmaker husband, Taika, 48. 

Rita flashed the flesh in a black strapless mini dress, which she teamed with a baseball cap, chunky gold hoop earrings and matching bangles, while Thor director Taika kept his look casual in comfy-looking pants and a white T-shirt.

The happy couple, who got married in August 2022, cuddled up to Taylor for a photo backstage and the Let You Love Me singer even asked Taylor's boyfriend Travis Kelce for a picture too.

The Kansas City Chiefs football player was dressed in a blue spotty T-shirt and matching shorts, and flashed a huge grin as he towered above Rita, while an animated Katy could be seen in the background.

Rita captioned her Instagram post: 'It's fair to say Sydney always delivers - Or shall we say our TayTay @taylorswift always delivers! thank you for having us! Seeing my KP @katyperry made my heart to many queens to count! (sic).'

Katy was quick to comment on the post and simply wrote: 'ily,' which is short for 'I love you,' while her own fans couldn't believe that she posted a video of her singing along as Taylor performed Bad Blood.

British singer Rita posed for a photo with Taylor's NFL player boyfriend Travis Kelce

Rita and Katy appeared to be having a great time at the concert and both looked chic in their black attire

Rita thanked Taylor for having her at her concert and gushed that the singer 'always delivers'

'The fact you added bad blood is everything,' one follower commented, while another wrote: 'the way she sang bad blood, without any bad vibes, they gave it to me everything, mothers mothering.'

A third person posted: 'Not you posting bad blood that's so iconic,' while a fourth fan begged: 'WE NEED A TAYLOR SWIFT & KATY PERRY COLLABORATION PLEASE.'

The pair first fell out with one another a decade ago, and TMZ reported that the feud between the performers ignited when three of Taylor's dancers quit to join Katy's Prismatic World Tour. 

Taylor released the single Bad Blood and added fuel to the fire, in a now infamous interview with Rolling Stone, when she admitted that the track was about a female musician - and 'straight-up enemy.'

Added fuel to the fire, in a now infamous interview with Rolling Stone Taylor admits that the track was about a female musician - and 'straight-up enemy.'

She told the publication: 'For years, I was never sure if we were friends or not.

'She would come up to me at awards shows and say something and walk away, and I would think, "Are we friends, or did she just give me the harshest insult of my life?"

'Then last year, the other star crossed a line. She did something so horrible, I was like, "Oh, we're just straight-up enemies." And it wasn't even about a guy!

The 34-year-old pop star put on a show-stopping performance for her first night at Sydney's Accor stadium

Taylor and Katy pictured together at the 2011 American Music Awards, a couple of years before their feud

'It had to do with business. She basically tried to sabotage an entire arena tour. She tried to hire a bunch of people out from under me.'

After Taylor's interview was published, Katy tweeted an alleged slant in Taylor's direction and wrote: 'Watch out for the Regina George in sheep's clothing,' referring to Rachel McAdams' bitchy character in Mean Girls.

Then in May 2017, Katy seemingly retaliated to Taylor's Bad Blood track with her own single Swish Swish, which was also reportedly about their feud. 

However, a year later Katy reached out to her former friend with an olive branch and a handwritten note which began: 'Hey old friend, I've being doing some reflecting on our miscommunications and though feelings between us.'