Boris Johnson has added his voice to the campaign urging the law to be changed to allow gay marriage, the latest in a string of high-profile Tory politicians to do so.
Describing marriage as a "happy state" which is bucking a national trend by increasing in London, Boris uses a Youtube video to say he believes gay couples should be entitled to get involved.
The Mayor of London famously said in 2001: ""If gay marriage was OK - and I was uncertain on the issue - then I saw no reason in principle why a union should not be consecrated between three men, as well as two men, or indeed three men and a dog."
He is also on record as saying gay marriage "can only ever be a ludicrous parody of the real thing", but Boris changed his mind on all of this more than two years ago, when he told the website Pink News:
"If the Conservatives and Liberals can get together in a national coalition and settle their differences, I don't see why you can't have gay marriage".
It'll come as a relief for David Cameron that Boris Johnson - a contender to succeed Cameron as Tory leader - actually agrees with him on a policy. The Mayor of London has been criticising government decisions for several days, particularly over the selling off of playing fields and targets for teaching PE in schools.