Christina Aguilera's new fiance spent a year designing her engagement ring.

The 33-year-old singer's boyfriend, Matt Rutler, popped the question on Valentine's Day (14.02.14) and he spent months planning the proposal because he wanted to ''reflect'' their ''journey'' in the jewellery.

A source told Us Weekly: ''Matt has been working on the ring for over a year and been working on the proposal for several months.

''Matt spent a year's time mastering all the specific details with the designer to signify their love and their journey together - it's all reflected in the ring.''

Matt - who has been dating Christina since they met on the set of her 2010 movie 'Burlesque', on which he was a production assistant - took inspiration from two of the 'Beautiful' hitmaker's favourite pieces of jewellery and thought carefully about the meaning behind the nine gemstones which accompany the diamond.

The source continued: ''Matt knew what her two favourite rings were and married them together into one, incorporating all the details that she specifically loved. Every jewel and diamond placing has a reason and meaning for being placed there.''

The coloured gemstones were placed beneath the main diamond ''so they always touch her actual skin in forever-encouraging love ... and surrounding her at all times.''

The band is also woven with diamonds to symbolise how the couple's bond will continue to grow stronger.

Christina was previously married to music executive Jordan Bratman, for five years until 2010, and they have six-year-old son Max together.