TOPLESS model turned business-phenomenon Katie Price faced double-trouble during the Brighton half marathon.

The silicone-enhanced 38DD star's knees gave out!

The glamour model, formerly known as JORDAN, yelped in pain throughout the race, tweeting that her 'knees went,' but she still managed a respectable time of two hours, 34 minutes.

And the 33-year-old was cheered on by her on/off boyfriend Leandro Penna.

Katie tweeted afterwards: “I finished Brighton half marathon 2hrs34mins sooo gutted both my knees went so I struggled but thinking of Vision Charity got me through xx.”