Pippa Middleton and her boyfriend Nico Jackson look, well, relaxed in each other's company in the back of a black taxi, leaving the 50th anniversary party for London nightclub Annabel’s.

But are they close enough to tie the knot? Pippa was hinting that could be the case in her most recent newspaper column, writing, "Next stop, a flower-arranging course. Maybe I’ll be a DIY bride?"