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On Radio 1's this week, Gemma Cairney and Dr Radha will be tackling the tricky topic of honesty.

It's the best policy, we're always told, but it can also be one of the toughest.

So before Radio 1 tries to tackle listeners issues around being honest, here's 7 stars who have been super honest about their past actions, even when it has meant facing up to bad behaviour or something they regret.

made a big return to the UK charts in 2016 with his single Say You Won't Let Go, but it probably wouldn't have happened if he hadn't made some apologies first.

"I don't discriminate against any type of person," he told Radio 1 Newsbeat, speaking about the homophobic lyrics that seemingly ended his career in 2013.

"It was taken out of context and I didn't mean to offend anyone at all. But I make no excuses and I dealt with the whole thing in the wrong way."

In the same interview, he also admitted that he had struggled with depression, anxiety and a cannabis habit.

December 2016 was a tough year for fans, as singer quit the group after months of rumours.

It wasn't an amicable split, with Fifth Harmony sharing a shockingly honest account of the group's internal struggles in a Twitter post.

"Over the past several months we have consistently made every effort to sit down and discuss the future of Fifth Harmony with Camila," they wrote.

"We have spent the past year and a half (since her initial solo endeavour) trying to communicate to her and her team all of the reasons why we felt Fifth Harmony deserved at least one more album of her time, given the success of this past year that we'd all worked so hard for.

"We called for group meetings which she refused, we asked LA Reid and the label to step in and try to set meetings, which again, she refused. We even went as far as group counselling which she did not show up to.

"We have tried with exhausted efforts and hearts to keep this group alive as the five of us, and we want it to be very clear that unfortunately those efforts are not mutual."

shocked fans in 2016, the day after her 24th birthday, when she admitted to having a career crisis during a live show in Indonesia.

"Tonight I felt extremely unauthentic, unconnected to both myself and my music," she wrote on Instagram in July 2016.

"I’ve never really felt like my materials, wardrobe or a video could define me. I act on a moment and fear something that hasn’t happened. I’m stagnant, I stay still and don’t just sit with myself first and ask, ’Is this where I am, whole heartedly?’

"I’ve always told the truth. I’m always true to my word, I’ve shown who I am but I need to rethink some areas of my life creatively and personally. Had to get that out."

In 2014, boys and were seen allegedly smoking weed in a video that was leaked and shared online.

Both boys kept quiet on the matter, but bandmate Liam Payne addressed the issue in a string of honest tweets shortly after the incident.

"We all have a lot of growing up to do in extreme circumstances. I'm not making excuses but it's fact we are gonna fall short somewhere," he wrote.

"We are only in our 20s we all do stupid things at this age.

"Hopefully we stand the test of time an get it right in the end I don't take this for granted and I'm extremely grateful to be here doing this."

probably regretted comparing 2013 VMAs performance to a stripper, especially when he was forced to confront his comments the following year in an interview with The Sun.

"I was a bit of a ****," he told the tabloid. "I do feel bad about it as I'd be livid if someone said that about me."

He added that he had meant his comments to be taken more positively, but that hadn't expressed himself quite how he had planned.

"My general point was I wanted her to sing the songs so people could see what an amazing artist she is. I just worded it wrong."

has had his fair share of controversies and made a number of apologies in his time, but his message to fans after some bad behaviour on stage in the UK was one of his most honest.

He ranted at fans in Birmingham and stormed off stage in Manchester during his world tour in 2016, but explained his actions on Instagram.

"There's going to be times where I say the wrong thing, because I'm human," he wrote. "But I don't pretend to be perfect and I hope to God that, you know, I don't say the right thing all the time because if that was the case then I'd be a robot.

"There's times when I get upset, times when I get angry, there's times when I'm going to be frustrated."

was forced to get honest with herself and her fans after she was caught licking a doughnut in a US store in 2015.

She later spoke openly and honestly about the incident in a YouTube video, which has since been deleted.

"First of all, I mean, my behaviour was very offensive," she said.

"There’s no excuse or there’s nothing to justify it.

"As human beings we all say and do things that we don’t mean at all sometimes, and we have to learn from it.

"I think one of the biggest things I learned from that was what it feels like to disappoint so many people who love and believe in you, and that’s an excruciating feeling."