Celebrity Tweets: Joel Madden, Rihanna, Ellen DeGeneres, Joan Rivers, Katy Perry, Ricky Gervais & More

Celebrities were alive and well on Twitter this week, keeping us up date with celebrity news (thanks, Ellen!), displaying their wicked sense of humour and taking time to pay their respects. Yep, when celebrities hit Twitter, they bare all, just like we do — and we're more than happy to keep our eye on all the happenings over the course of the week. Want to know what Katy Perry thinks of Tokyo? Interested in why Ricky Gervais needs Liam Neeson's help? And which TV show has Maroon 5's Adam Levine discovered (and subsequently become addicted to)? All that, and more, is right here in this gallery. Click through!