Avril Lavigne reunited with her ex-husband Deryck Whibley as the pair played a set together during Vans Warped Tour rock festival.

The Canadian singer, 40, took to Instagram on Monday to share a gushing message about performing with her ex.

Avril and Sum 41 musician Deryck, known by his stage name Bizzy D, got engaged in 2005 when he was 26 and she was 21. They married a year later. 

But by 2009 the couple had split, with reports saying Avril felt she had ‘married too young’.

However, the two appear to still be on friendly terms, as Deryck, now 45, unexpectedly joined Avril during her headline performance at the rock festival Vans Warped Tour in Washington DC.

Gushing over her ex, Avril wrote: ‘This legend @deryckwhibley from @sum41 joined me for one of the best pop punk anthems of all time In Too Deep.’

Avril Lavigne reunited with her ex-husband Deryck Whibley as the pair played a set together during Vans Warped Tour rock festival (Seen last month)

Avril and Sum 41 musician Deryck, known by his stage name Bizzy D, got engaged in 2005 when he was 26 and she was 21 (Seen in 2007)

She added of the show: ‘Headlined @vanswarpedtour last night and it was everything I would have expected and more! 

‘It was one of the best crowds and you guys know how to rock.’

The Girlfriend singer became engaged to Sum 41 leader Deryck in 2005, with the couple marrying the next year when Avril was 21 and Deryck was five years older.

The duo exchanged vows in a traditional Catholic ceremony at a private estate in the coastal city of Montecito, California, when Avril was 22 and Deryck was 27.

By 2009, the pair had gone their separate ways, with a source telling People she ‘married too young’.

Discussing the news on her blog, Avril penned: ‘We have been friends since I was 17, started dating when I was 19, and married when I was 21. I am grateful for our time together, and I am grateful and blessed for our remaining friendship.

‘I admire Deryck and have a great amount of respect for him. He is the most amazing person I know, and I love him with all my heart. 

‘Deryck and I are separating and moving forward on a positive note.’

Gushing over her ex, Avril wrote: ‘This legend @deryckwhibley from @sum41 joined me for one of the best pop punk anthems of all time In Too Deep’

The Girlfriend songstress got engaged to Sum 41 frontman Deryck in 2005 and the pair got hitched the following year when she was 21 and he was five years her senior (Seen in 2006)

By 2009, the pair had gone their separate ways, with a source telling People she ‘married too young’ (Seen in 2007)

Fans were delighted to see the pair on good terms as they commented: ‘This is so so wholesome!’;

‘UGHHHHHH THIS IS ME (crying face) WHEN I SEE MY DIVORCED PARENTS GET ALONG,’;

‘I’m a child of divorce,’; ‘AWWW!!! Love seeing you two together again!’; ‘Mom and dad ❤️,’;

‘I love to see the respect you and Deryck have for each other!! Congrats on the show,’;

‘So cool to see you with Deryck after so long,’; ‘The scream I let out when this happened,’;

‘You both know we are all kids from these separated (but still friends) parents, right? ❤ love you guys!’;

‘How sweet to see you two together! So great you can treasure each other like that.’

Avril walked down the aisle for the second time to Nickelback singer Chad Kroeger in a gothic South of France ceremony.

Fans were delighted to see the pair on good terms as they commented: ‘This is so so wholesome!’

The couple tied the knot in 2013 a year after they started dating but it wasn’t meant to be and by 2015 they had split.

Despite going their separate ways the pair have also remained good friends and continue to spend lots of time together.

After a string of flings, Avril later began dating Mod Sun in 2021 and their relationship quickly progressed, with the couple getting engaged the same year.

They shocked fans when it emerged they’d split in February in 2023 and Mod Sun said he was ‘blindsided’ when the singer called it quits.

She has since been linked to Tyga and country music singer Nate Smith.