Britain's Prince Harry reportedly doesn't mind his army pals calling Pippa Middleton his "wifey in the making".

The 28-year-old royal is a helicopter gunship pilot and is currently serving in Afghanistan. Harry was sent a copy of Pippa's Celebrate book recently - which contains tips on how to throw the ultimate seasonal parties.

The prince's comrades are reportedly convinced the royal will end up marrying the Duchess of Cambridge's younger sister.

"Harry's the subject of lots of banter. Everyone winds him up about Pippa. They take the mickey out of their friendship by calling her his wifey in the making," a source told British newspaper The Sun.

"Harry loves a good joke, even if it's about him."

Pippa allegedly signed a 400,000 deal for her party ideas. Sources say the 29-year-old's Celebration tome has worked wonders at Harry's base camp.

"He couldn't resist reading chapters out loud. It's raised morale and caused some much-needed cheer," the insider added.