Britain's Prince Harry will reportedly propose to his girlfriend under the Northern Lights.

The 29-year-old royal has been dating Cressida Bonas, 24, since May 2012, when they were introduced by his cousin Princess Eugenie.

There has been extensive speculation that he is planning to pop the question, with claims he has now decided on how he will mark the special occasion.

"Harry's been training in Iceland for his walk to the South Pole in November and has fallen in love with the country. He wants to propose somewhere close to his heart and he wants to take Cressida to the famous Ice Hotel and then pop the question under the Northern Lights. He knows she'll love this," an insider told British magazine Heat.

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  • Cressida Bonas

    Cressida Bonas at Annabel's club on May 15, 2014 in London, England. (Photo by Mark Robert Milan/GC Images)

  • Cressida Bonas And Princess Beatrice

    Cressida Bonas and Princess Beatrice of York at Annabel's club on May 15, 2014 in London, England. (Photo by Mark Robert Milan/GC Images)

  • Cressida Bonas and Princess Beatrice

    Cressida Bonas and Princess Beatrice of York at Annabel's club on May 15, 2014 in London, England. (Photo by Mark Robert Milan/GC Images)

  • We Day UK - Arrivals

    LONDON, ENGLAND - MARCH 07: Cressida Bonas attends We Day UK, a charity event to bring young people together at Wembley Arena on March 7, 2014 in London, England. (Photo by Tim P. Whitby/Getty Images)

  • Cressida Bonas

    Cressida Bonas attends the wedding of Jake Warren and Zoe Stewart in the Wren Chapel at the Royal Hospital Chelsea on December 14, 2013 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

  • Cressida Bonas is pictured leaving the wedding of Rupert Finch And Natasha Rufus on June 8, 2013 in Gloucester, England. (Photo by Simon James/FilmMagic)

  • Cressida Bonas attends a party celebrating the launch of 2&8 Club, a new night club in the basement of Morton's Private Member's Club, in Berkeley Square Gardens on September 27, 2012 in London, England. (Photo by Dave M. Benett/Getty Images)

  • Henry Van Straubenzee Memorial Fund Christmas Carol Service

    LONDON, ENGLAND - DECEMBER 04: Cressida Bonas attends a Christmas carol concert in aid of the Henry van Strauzenbee memorial fund at St Luke's Church on December 4, 2013 in London, England. (Photo by Danny E. Martindale/Getty Images)

  • Cressida Bonas

    Georgia Forbes and Cressida Bonas (R) attend The Ralph Lauren Wimbledon Party at the Ralph Lauren store in Brompton Road on June 21, 2011 in London, England.

  • Cressida Bonas

    Cressidea Bonas, left, the girlfriend of Britain's Prince Harry, leaves after attending the wedding of the Duke and Duchess of Northumberland's daughter Lady Melissa Percy to chartered surveyor Thomas van Straubenzee at St Michael's Church in Alnwick, England, Saturday, June 22, 2013. (AP Photo/Scott Heppell)

  • Cressida Bonas

    Cressida Bonas, who is the girlfriend of Britain's Prince Harry, leaves after attending the wedding of the Duke and Duchess of Northumberland's daughter Lady Melissa Percy to chartered surveyor Thomas van Straubenzee at St Michael's Church in Alnwick, England, Saturday, June 22, 2013. (AP Photo/Scott Heppell)

  • Cressida Bonas

    Cressida Bonas attends the wedding of Melissa Percy and Thomas van Straubenzee at Alnwick Castle on June 22, 2013 in Alnwick, England. (Photo by Danny E. Martindale/Getty Images)

  • Cressida Bonas

    Cressida Bonas attends the wedding of Melissa Percy and Thomas van Straubenzee at Alnwick Castle on June 22, 2013 in Alnwick, England. (Photo by Danny E. Martindale/Getty Images)

  • Cressida Bonas

    Cressida Bonas and Princess Eugenie attend the wedding of Melissa Percy and Thomas Straubenzee at St. Martin's Church in Alnwick

  • Cressida Bonas

    Cressida Bonas attends the WTA Pre-Wimbledon Party at The Roof Gardens, Kensington High Street, London.

  • Cressida Bonas

    Isabella Calthorpe and Cressida Bonas attend the WTA Pre-Wimbledon Party at The Roof Gardens, Kensington High Street, London.

  • Cressida Bonas

    Cressida Bonas arriving at the WTA Wimbledon Party 2013, at Kensington Roof Gardens, London.

  • Cressida Bonas

    Cressida Bonas arriving at the WTA Wimbledon Party 2013, at Kensington Roof Gardens, London.

  • Cressida Bonas

  • Cressida Bonas

    Cressida Bonas, Prince Harry's girlfriend, attends day 3 of the 2013 Glastonbury Festival at Worthy Farm on June 29, 2013 in Glastonbury, England.

  • Cressida Bonas

    Cressida Bonas, Prince Harry's girlfriend, attends day 3 of the 2013 Glastonbury Festival at Worthy Farm on June 29, 2013 in Glastonbury, England.

  • Cressida Bonas

Although Harry and Cressida have been together for a while, they largely fly under the radar. This is said to be because she has struggled to adapt to being thrust into the spotlight.

The prince is thought to have been ready to propose for some time, but wanted to make sure he wasn't pushing Cressida into public life.
"Harry's love life has always made headlines, but she's struggled with the limelight. The big advantage of sneaking off is that they can truly be alone," the source added.

"Harry wants to take her away around Christmas time. Probably before New Year."

In September it was reported that Harry and Cressida had discussed becoming engaged with their respective families.

Harry's brother Prince William gave his now-wife Catherine a few months to decide if she was ready to accept his marriage proposal before they officially announced it in 2010 and he is said to be following in his sibling's footsteps.

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