There’s trouble in paradise for the YouTuber couple that didn’t actually get married – but certainly caused a splash with their $500,000 Las Vegas ceremony – after Tana Mongeau took to Twitter and Instagram to acknowledge her so-called “husband” Jake Paul’s lunch at Panera with his “ex-girlfriend” Erika Costell.

Late Saturday night, Mongeau posted an Instagram story singing a parody of “thank u, next” by Ariana Grande, replacing the lyrics with allusions to her own topsy-turvy love life.

“Thought I’d end up with Bella, yet it wasn’t a match, wrote some songs about Hunter, now I listen and laugh. Even actually got married, and for Jake I’m so thankful, except when he goes out to lunch with his ex, and I find out on Twitter,” Mongeau sang, interspersed with laughs.

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"Bella" refers to Bella Thorne, Mongeau's ex-girlfriend, who she maintained an open relationship with for around a year and five months, and recently clashed with on Twitter over breaking "girl code." "Hunter" is Mongeau's frequent collaborator, who she told fans she had a complicated on-and-off-again relationship with.

The Instagram story was posted after photos surfaced on Twitter of Paul dining at a Panera with Erika Costell, a YouTuber he staged a relationship and wedding with, although later told The New York Times was fabricated "like the WWE." Fans also posted Instagram stories on Twitter from seemingly earlier in the weekend that show Paul and Costell at a birthday party together.

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After her nuptials, Mongeau and Paul were supposed to honeymoon in Europe, but Mongeau explained to her fans via tweets and Instagram story posts that she has been experiencing a "family emergency" and has had to spend time apart from Paul in Las Vegas, where her parents live.

Read more: 26 photos show the wild antics inside Jake Paul and Tana Mongeau's $500,000 Vegas wedding, including a 'Game of Thrones' sword and a massive mid-ceremony brawl

Mongeau also told fans in an Instagram story that her grandmother died on Thursday, and that she has been spending the two weeks since her wedding traveling to and from Las Vegas to deal with the aforementioned family emergency, in addition to her grandmother's death.

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It is unclear where Paul has been throughout Mongeau's family emergencies, although neither of her parents seem to have attended the Las Vegas wedding, and fans spotted Paul in photos with Logan in Ibiza after their ceremony, and he posted that he was in Cleveland at the time of the Panera lunch with Costell.

Logan and a co-host of his podcast "Impaulsive" also replied to Mongeau on Twitter, after she tweeted "lmao wtf 😃" at around the same time she uploaded the "thank u, next" parody to her Instagram story.

Logan's co-host, Mike Majlak, first replied with "big facts," and Logan then replied to Majlak and Mongeau with "huge actually."

The legitimacy behind the latest twist in Mongeau and Paul's relationship is questionable, given the contradictory narratives posed by Mongeau's series with MTV and her assertions to fans on social media. She has claimed repeatedly that her union to Paul is emotionally legitimate, if not legally, and that she is in love with him.

Read more: YouTuber Tana Mongeau admits her wedding isn't legally binding on paper, but slams critics who think she and Jake Paul are 'just putting on this show'

On MTV's "No Filter: Tana Turns 21," which Mongeau has since claimed was "pulled out of context," she said her wedding was "for fun and for content," and noted that she and Paul maintain an open relationship.

Apart from Logan's tweet, neither Paul brother nor Costell have acknowledged the fanfare around the Panera photos. Mongeau has since moved on to tweeting about other topics.