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Next time you bump into your ex in the street, or stick your head in a book to avoid eye contact with them on the train, spare a thought for Bella Hadid and . The once-friendly exes, now maybe slightly less friendly because he's dating Bella's former mate , were both in the H&M Studio fashion show last night - her modelling, him singing new track Nothing Without You.

Not ideal, eh? But the former lovebirds are far from the only celebrity exes who've had to put on a brave face and work together - just take a look at this lot.

Throwing it way back, and Tony dated for seven years when they were in together... until he broke up with her. Cue Gwen writing break-up anthem Don't Speak and the band performing it on tour every night for 28 months, with Tony labelling the experience "so brutal but I don't know how we made it through".

Despite the trauma, Gwen and Tony are still friends and bandmates (pictured above with musician Dr. Madd Vibe), and her 2005 single Cool is thought to pay homage to their now-'Cool' relationship.

That awkward moment when you arrange to go on tour with your boyfriend and then you break up, but you still have to go on tour together... Yup, these Camp Rock co-stars ended their relationship in May 2010, and was a guest on the ' Live In Concert World Tour from August that same year.

Good job they remained friends, with Demi even heading out on a joint tour with 's brother in 2016, and Joe popping up for a little Camp Rock reunion at the Washington D.C. date. Aww.

Thankfully filming on the last Twilight film had wrapped when Kristen Stewart admitted to an affair with married Snow White And The Huntsman director Rupert Sanders, but she and scorned boyfriend Robert Pattinson still had to go through the movie's promo cycle together, which must have been awks to say the least.

They did reconcile for a bit, and were very much together at the premiere of Breaking Dawn Part 2, but it didn't last. Sob.

The Vampire Diaries co-stars continue to work together, despite their three-year relationship ending in 2013, and Ian marrying another actress with vampy connections - Twilight's Nikki Reed. Rumour had it Nikki and Nina weren't fans of each other, until the trio posted selfies together on Instagram earlier this year, with Ian clearing the whole thing up in one caption.

"After years of websites pretending these two badass ladies knew each other well and baseless, false information of back stabbing and hatred from low-brow websites filled the minds and hearts of fans... They were finally able to get together for their first real dinner," he wrote. "Let's stop spreading hate everyone, there's already too much of that right now in our world."

They started dating on the set of X-Men: First Class back in 2010, broke up in 2013, then rekindled their relationship during filming for X-Men: Days Of Future Past. Sadly it wasn't to be and J-Law and Nicholas split for good in 2014, but have successfully filmed another X-Men film together, and don't seem to have a problem with bumping into each other at awards shows.

The Big Bang Theory co-stars secretly dated for two years, but even after they broke up in 2009, Johnny and Kaley's characters were still an item on the show. Thankfully, they're now best buds in real life, so Penny and Leonard's on-screen wedding in 2016 wasn't awkward at all.

Jack and Meg White got married way back in 1996, despite initially telling the public they were brother and sister, and actually divorced in 2000 before really hit it big. The pair continued to perform together until 2009, officially disbanding in 2011. In 2014, Jack told Rolling Stone, "I don't think anyone talks to Meg. She's always been a hermit."