Pippa and the city slicker: The romance everyone's talking about
She was often seen alone at social gatherings, including weddings, prompting speculation that their romance was over.
But those close to the couple said that his busy career and the constant media attention made it difficult for them to step out publically.
"Alex absolutely dotes on her and they are really very serious," said one friend.
"They do spend a lot of time together but they like to keep their romance under the radar.
"Alex particularly doesn't like lots of fuss and he finds the interest in their relationship baffling and somewhat bemusing"