Brother James Middleton.
Kate Middleton's siblings were seen enjoying a leisurely stroll around London on Wednesday.
The casual walk appeared to be a welcome reprieve for Pippa, who has reportedly called it quits with boyfriend Alex Loudon.
Of course, the Duchess of Cambridge's younger sister has apparently been spending quite a bit of time as well with her other ex George Percy, so the girl does seem to have another shoulder to lean on other than her bro's.
But at least with James, she won't ever have to worry about it slipping out from under her.