By Amelia Proud
It didn't take a genius to predict that falling into the arms of a notorious womaniser after having your heart broken by a former sex addict, would end in tears for Katy Perry.
And though she wasn't crying last night, the 27-year-old was wearing the result of the recent break up all over her face.
Not in a good place: Katy Perry looked sombre as she left a bar in Santa Monica with a mystery man
The Firework singer looked sombre as she left a bar in Santa Monica wearing a diaphanous black dress that showed off her glorious figure and black underwear.
The outfit screamed defiance; a glorious evocation of what the 34-year-old is missing.
But Katy's face was showing the strain of this recent heartbreak keenly.
Stunning: Katy looked lovely but fierce in the eye-catching outfit, but her face was filled with sorrow
Friends: Katy was surrounded by her crew on the night out
Mayer is said to have told the singer that he was a changed soul but running true to form, quickly became tired... they're not said to have remained friends.
'John did a real number on Katy,' a source told RadarOnline.com.
'She held off from his advances for the longest time, but he laid on the charm thick and promised her he was a changed man. She eventually gave in, fell head over heels for him and then - yep - once he had made his conquest, he dumped her.'
Baring all: Perry's outfit was revealing without showing off any flesh, a cunning ruse
The website added that the couple were spotted at a friend's dinner party on Tuesday night, where they completely ignore each other.
'It was so weird! Katy stayed in one room the whole night and John stayed in the other and when they passed each other they both just kept their head’s down.
'It was like they had this incredible animosity for each other and everyone else at the party could feel it,' an eyewitness told them.