Nothing to it, they’re surrounded by people, it’s not as though they were walking alone.
He’ll probably fantasize about her for a good long time ;-)

Give us a break. Bono’s wife and daughters are walking with them, they are conveniently cropped from those pics (but visible in other shots) Bono took the hands of the two celeb girls in their party to lead them away from the hounding paparazzi. It isn’t nice to make up stories like this about people. Karma’s gonna get you!