By Kaitlin Easton,Sam Elliott-Gibbs Sir Rod Stewart and Johnny Depp teamed up for a surprise gig to raise money for Celia Hammond’s Animal Trust. The duo performed at the posh Ned Hotel in London, raising nearly £250,000 for the charity that helps stray cats and kittens. The actor and rocker kept their collaboration under wraps, but delighted the audience with performances of Sir Rod’s hits like Maggie May and Forever Young, while Johnny showed off his guitar skills. “Celia’s devotion and commitment to protecting vulnerable and neglected animals is beyond admirable,” Johnny told DailyMail.com….