Theirs was a whirlwind romance fit for a Hollywood movie.
She was the rising popstar, he was a comedian-turned actor who was just breaking into the US, and from their very first date, Katy Perry and Russell Brand were smitten.
"You're a mermaid and I'm drowning," Russell told the Teenage Dream singer as he drove her home in September 2009, before gifting her with a sensational black diamond necklace.
