This lovely photo shows Bill and Melinda Gates meeting David Cameron at Downing Street.

The Microsoft founder and his wife held the private talks with the PM yesterday during their visit to London to launch their latest charity project, Living Proof.

Bill Gates at Number 10

Gates said on his Twitter page that they’d gone to London “to thank the UK people for their remarkable commitment to foreign aid”.

But this was not necessarily the main headline-grabbing part of the visit.

As the Daily Mail pointed out in its report, what really rocked was the fact that Gates spruced himself up a bit for the occasion.

As you can see, he opted to ditch his usual “geek chic” look and sport a pin-striped suit and tie.

We’re sure the PM appreciated it.