The Rock of Ages actor reportedly dumped his girlfriend Isabella Brewster after falling for Geri while the pair were rehearsing for the London Olympics Closing Ceremony earlier this month.
A friend of Russell’s told The Sun newspaper: “Things are getting very serious between them – they’re a proper couple now. They had met several times in the past but really got to know each other during the Olympics.
“People thought Russell was joking at the time when he said he had a crush on Geri all over again, but it was true.
“They just clicked – they have so much in common. He is spending so much time in London just to be with her.”
Another friend revealed he dumped Isabella because of Geri.
The pal explained: “He ended his relationship with Isabella and is now dating Geri properly.”
The pair were also spotted on a romantic date at Hampton Court Palace.
Fellow visitor Greg Oram said: “I thought it was the most random thing ever to see Russell Brand of all people in a place like that – until my wife pointed out that he was with a Spice Girl.
“They seemed like they were having a really great time, holding hands and chatting – it was 100 per cent obvious they were a couple.
“Geri was holding his hand the same way I hold my wife’s, it was so cute.”