Today on Twitter, Bruno Mars brushes up on his English -- Cockney style. The singer learned new slang terms like 'loaf' and 'friar.' Josh Groban tweeted get well wishes to Katy Perry, who had to cancel two shoes due to food poisoning and Nick Lachey pays a visit to his home town of Cincinnati, Ohio. The Game tweeted about his kids (cue all the 'aww's') and Jordan Knight gets into shenanigans at DisneyLand. Read what the stars were tweeting today!