Harriett Blackmore's entrance rocks the villa tonight as she arrives and immediately kisses her ex Ronnie Vint just moments after arriving on the show.
The Love Island star, 24, dated her co-star, 28, for a few months after leaving the villa together in the summer before the former couple decided to call it quits.
Ronnie joined the show in the first episode and struck up a romance with TOWIE star Elma Pazar, with the pair hitting a few stumbling blocks so far.
They argued after Ronnie kissed their co-star Kaz just moments after smooching her and then again after he branded fellow Islander Tina Stinnes 'fit' this week.
Harriett's arrival is no doubt set to ruffle feathers again as Ronnie tells her: 'When you walked in my heart went, and it's never gone like that…'
Her bombshell appearance in the villa came during a kissing challenge, where Islanders were they all lined-up blindfolded and ranked kisses out of 10.
Harriett Blackmore's entrance rocks the villa tonight as she arrives and immediately kisses her ex Ronnie Vint just moments after arriving on the show
Harriett's arrival is no doubt set to ruffle feathers again as Ronnie tells her: 'When you walked in my heart went, and it's never gone like that…'
Later that night Ronnie pulls Harriett for a chat on the terrace
Harriett arrives just after Montel, who is very into his kisses with Kaz and Catherine, suggesting that these are the two women he will have his eye on.
Elma ensures Ronnie has the best kiss and he rates her a 10 but things are about to get shaken up as Harriett enters whilst the boys are blindfolded and none the wiser.
Clocking her arrival, Ronnie's partner Elma, says: 'No f*****g way!'
Making her way down the line of boys, Harriett eventually gets to Ronnie for her final kiss as Elma watches on.
Scott asks: 'Who was that?'
Later that night Ronnie pulls Harriett for a chat on the terrace as the girls are below on the daybeds listening in.
Ronnie tells her: 'When you walked in my heart went, and it's never gone like that…'
Ronnie's comments suggest there could be unfinished business between the pair as they discuss their relationship.
The girls are on the day bed listening into the discussion taking place
Her bombshell appearance in the villa came during a kissing challenge, where Islanders were they all lined-up blindfolded and ranked kisses out of 10 (pictured Kaz and Curtis)
Harriett arrives just after Montel, who is very into his kisses with Kaz and Catherine, suggesting that these are the two women he will have his eye on
Making her way down the line of boys, Harriett eventually gets to Ronnie for her final kiss as Elma watches on
Harriett will also no doubt want to pull Ronnie up on claims he was texting ex-Islander Olivia Hawkins while he was dating her.
While Harriett and Liv won't clash because she left the villa on Wednesday, the new arrival will still have the change to hash it out with her ex-boyfriend.
Harriett's arrival was revealed by MailOnline earlier this week, as she revealed plans to confront ex-boyfriend after he admitted to sending flirty messages.
Olivia reportedly engaged with the interaction and even Photoshopped an image of the couple holding hands with her face.
Now, Ronnie is in a couple with TOWIE's Elma, 31, but their blossoming romance could be under threat following Harriett's explosive return.
A TV source told MailOnline: 'Harriett can't wait to confront Ronnie for embarrassing her in front of the nation and will be going into the villa with all guns blazing.
'She had no idea he had been messaging so many other girls during their time together and it's been frustrating for her to see this all play out on the show without having her say.
'As well as Ronnie, she will have words for Olivia because her girl code wasn't the best.
Harriett's arrival was revealed by MailOnline earlier this week, as she revealed plans to confront ex-boyfriend after he admitted to sending flirty messages
A TV source told MailOnline: 'Harriett can't wait to confront Ronnie for embarrassing her in front of the nation and will be going into the villa with all guns blazing
Harriett and Ronnie met on the ITV2 show last summer and continued to date outside of the villa until splitting up in September
'Harriett is still looking for love and hopes her ITV comeback will see her connect with a man who's willing to settle down and be faithful.'
The reality star's return comes after Bad Boyfriends host Olivia Attwood revealed on her Instagram stories that she had seen the messages between Ronnie and Olivia.
Olivia said the All Stars contestant even jokingly Photoshopped her face onto an image of Harriett holding her hands with Ronnie while they were still in a relationship.
Presenter Olivia, who starred on Love Island in 2017, has the inside story because her husband Bradley Dack is Ronnie's best friend.
Harriett has already reacted to Ronnie's confession, posting an image of herself wearing a see-through black bodysuit alongside the caption: 'Best thing you never had.'
Her entrance follows the arrival of bombshells Grace Jackson and Ron Hall, who made their way back into the villa on Monday night's show.
Olivia, who is currently coupled up with Marcel Somerville, told the villa Ronnie had sent her flirtatious messages over Instagram while he was still dating Harriett
After being in a love triangle during his first appearance on the show last year, Ronnie found himself back where he started between Elma Pazar and Kaz Crossley
In Tuesday night's instalment, viewers will see Grace grow close to Nas Majeed after the pair bond over their love of cats.
But their flirtation doesn't go unnoticed by Cathrine Agbaje, who's in a couple with Nas and has been wanting more from their pairing.
Talking to Elma, Catherine says: 'It's nice to feel wanted and I just don't, I know Nas is a slow burner… it's just starting to get to me.'
Elsewhere in the episode, Scott Thomas and Tina Stinnes spend more time together after the Made In Chelsea star stole the Islander from India Reynolds, leaving her dumped from the show.
Scott admits: 'I feel relaxed, I feel chilled, a completely different experience with you and I like your vibe a lot.'
Tina adds: 'I'm a happy person but I think you're making me happier… I'm enjoying getting to know you every day.'
In the evening, Scott and Tina share their first kiss together, which they joke was worth the nine-year wait after they almost connected during their first appearance on Love Island in 2015.
- Love Island: All Stars continues tonight at 9pm on ITV2 and ITVX
