The 'Teenage Dream' hitmaker and the British comic parted in December after just 14 months of marriage, reported Contactmusic.
"She's so much happier since she and Russell ended. She's not miserable at all. We're all really happy for her. It was the right decision that the marriage ended. Life's good and her career is killing it. She's a free woman and she can do whatever she wants,' he said.
The 27-year-old has been romantically linked with Florence + the Machine guitarist Rob Ackroyd and French model Baptiste Giabiconi since splitting from Brand, but Wujek insists she is just having a good time.
"She's just a girl having fun. That's what these guys, Rob and Baptiste, popping up in her life are all about," he said.