He was amongst many to tweet his appreciation for Pippa Middleton following her star turn at the royal wedding.
"Congrats to William and Kate …and Kate’s sister. She was a hit," he posted.
Now, international heart-throb Justin Bieber has joined forces with the younger Miss Middleton, having signed a deal to sell his merchandise through her family firm, Party Pieces.
Under the heading “We’ve got Bieber fever”, browsers can purchase the 17-year-old Canadian’s branded paraphernalia.
Beliebers can shell out £20.89 on the Justin Bieber Ultimate Party Kit, containing party plates, cups, napkins and balloons as well as a birthday banner.
And there’s also a £13.99 Justin party piñata for a special birthday treat.
The singer, who was spotted frolicking on the beach in Maui with girlfriend Selena Gomez last week, is thought to be worth around $65 million.
How Miss Middleton made demure and discreet desirable again