The night before, she tweeted a picture of her swollen stomach after gorging on junk food.
And katie Price was probably regretting that move as she competed in the Brighton Half Marathon.
The glamour model struggled to finish the race, tweeting that her 'knees went,' but she still managed a respectable time of two hours, 34 minutes.
In pain: Katie Price struggles to complete the Brighton Half Marathon after experiencing knee pain in the last mile
And the 33-year-old was cheered on by her on/off boyfriend Leandro Penna, who affectionately hugged two of her three, Harvey and Princess, children from the sidelines.
He was seen planting a loving kiss on Katie's lips after her efforts.
She stood out among the competitiors in a bright pink Adidas T-shirt and matching shorts which she paired with black tights, a long-sleeved darker pink top and a pair of green gloves.
The brunette was seen crying out in pain as she struggled to finish.
Time for a stretch: The mother-of-three takes a break during the race after he knees gave out
Soldiering on: Katie look exhausted as she walks towards the finish line
Well done! Katie's on/off boyfriend Leandro Penna was spotted planting a kiss on the glamour model's lips after her effortsShe ran the last mile with her trainer.
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
Last night she had said: 'I'm gonna bounce to bed now up early for half marathon with my bro !!good luck to all the other runners xxxx'
Go mum! The Argentinian model affectionately holds onto Katie's son Harvey as he covers his ears from the noise
I did it! Katie, walking hand-in-hand with Harvey and her daughter Princess, waves to the crowd after completing the race
Katie was raising money for The Vision chaity, which supports blind, visually-ompaired and dyslexic children.
Yesterday she tweeted a photo of her sporting a suspiciously large belly.
But before her fans jump to any baby-minded conclusions, she explained that her swollen stomach was the result of overindulging on junk food.
Katie tweeted: 'Omg @leandro__penna and @abbi1985 and myself have pigged out on junk food tonight hahahaha lol.'
Don't catch a chill! Katie keeps warm after the race
Tunes helping her along: Katie earlier ran with a pair of massive purple headphones
She posed in the picture lounging on the couch, pushing her stomach out dramatically and surrounded by empty packets of chocolates and biscuits.
The pair's cosy night in, albeit with a friend, added fuel to the rumours that Katie and Leandro have reconciled.
But with Leandro supporting her today, it was clear the couple are back together.
While the usually very public reality star has stopped short of confirming she is back with the Argentinian toyboy, Price has been seen out in public with Leandro on a number of occasions and has sent gushing tweets to him.
I can touch my toes! Katie stretches before setting off
Penna wrote to his former girlfriend earlier this month: 'Your (sic) my perfect princess xx.'
In response Katie wrote, 'you are so gorgeous my perfect prince xx.'
Days later they were spotted sneaking out of a luxurious spa after spending the day there.
The pair reportedly broke up over the phone late last year, with a source telling the Sunday Mirror at the time: 'Katie knew in her heart that it was coming.
'She’s being very adult about the split and says she didn’t see it as a long-term relationship that would lead to marriage and kids.
Ready to go? The model squints in the sun as she looks forward to the race
Source: Daily Mail