But the 33-year-old looked stunning and in high spirits as she left a London clinic on Friday wearing a summery outfit.
The star wore a broad smile as she stepped out in a loose cream shirt which was tied at the neck and paired with olive-green skinny trousers.
She also wore a pair of tan ankle boots and and carried a khaki studded handbag.
She wore her long brunette tresses loose and completed her casual outfit with a pair of gold hoop earrings.
Earlier this weekend Kelly had been spotted partying up a storm in London.
She wore a glamorous sheer dress as she partied with hunky co-star Joe Brown on Friday night.
And Kelly Brook was ready to go again on Saturday night as she was spotted out and about in a stylish black shorts, before heading home to change into yet another LBD.
Just a week after discovering that boyfriend Danny Cipriani had allegedly cheated on her with six other women, Kelly was clearly out to prove that she wasn't wallowing in self pity.
The 33-year-old, who had spent Saturday driving around town with actor Joe, was spotted returning to her London home in high-waisted shorts and a satin top.
With a smile plastered firmly to her face, the sophisticated looking star seemed in high spirits as she breezed into her townhouse, soon to emerge in another outfit.
Clearly not wanting to hide herself away after Danny's betrayal, Kelly proved that she was made of sterner stuff as she made a quick turnaround and left looking even more glamorous than before.
Still smiling: Despite her split from 'love rat' Danny Cipriani last week, Kelly had a grin plastered firmly on her face
Quick change: Kelly popped home later in the evening and changed into a skintight black dress as she headed out again
She wore her hair in the same wavy style and looked fresh-faced, despite partying at Mahiki until the early hours the day before.
Kelly was wearing the same smile on her face as she jumped into a taxi, obviously wanting to make the most of her Saturday night.
That very morning the model arrived home in a knockout sheer polka dot dress with her hunky actor friend in tow, having reportedly racked up a staggering £10,000 bar bill at the Mayfair haunt.
Proving a point? The star certainly stood out in the tony black dress for yet another night out
Ms Brook, who has worked as a TV presenter, actress and model, shared pictures of the couple enjoying a romantic holiday in Greece online just a week ago, but has now deleted all photos of her former partner.
It is understood the sportsman is desperately bidding to rekindle their romance and has apologised, but the actress has so far refused to take him back. He is even said to be willing to undergo therapy.
Sticking close: On Friday night Kelly had arrived at Mahiki with actor Joe Brown in tow
Protective: Joe put an arm around Kelly as they went inside, obviously wanting to protect her
Posing up: Katherine later shared a picture of the trio inside Mahiki