Alex Song celebrated Barcelona's victory with Dani Alves

The West Ham midfielder was a guest in the visitor's dressing room and looked particularly pleased to have been reunited with the Brazilian right-back after the 2-0 win.

Alex Song was a notoriously divisive figure during his time at Arsenal and he is unlikely to have gone up in the estimation of Gooners after footage emerged of him celebrating Barcelona's victory at the Emirates Stadium with Dani Alves on Tuesday.

The West Ham midfielder and part-time fashionista moved from north London to Barcelona in the summer of 2012 and went from one of the linchpins of Arsenal’s midfield to a serial benchwarmer in Catalunia.

Sporting typically garish headwear, Song, on loan at Upton Park from Barcelona for a second successive season, captured himself on camera with Alves bopping along to Fifth Harmony’s smash hit 'Worth It' after Lionel Messi had secured a 2-0 first-leg victory in the Champions League last 16.

Whether Barcelona fans feel the £15 million their club invested in Song was 'Worth It', meanwhile, is another matter altogether...