The actress has been busy filming episodes for the third series of the hit TV musical, but she was forced to rest up on Tuesday (08Nov11) as she struggled to fight the lung condition.
In a post on her Twitter.com page, she writes, ""So grateful for a day of rest. This bronchitis is kicking my butt :/ hopefully I feel better tomorrow. Back to sleep....""
Riley isn't the only celebrity battling the illness - Kelly Osbourne was recently diagnosed with the same condition too.