Kate Hudson and Matt Bellamy are reportedly working on their relationship.

The 'Almost Famous' actress and the Muse frontman sparked speculation their engagement could be off when Kate was spotted without her ring at BVLGARI's Decades of Glamour party on Tuesday (25.02.14), but sources insist the couple are still very much together and are determined to make their love work.

An insider told E! News: ''They are OK. They go through their ups and downs like every other couple. It's true that occasionally they don't spend as much time together as they would like - work pulls them apart from time to time. But they are working on strengthening their relationship.

''They are optimistic about the future and see that it will work out. They don't think for a second that they won't get through this. They love one another very much and will do what it takes to make it work.''

This comes after The New York Daily News reported the pair had ''drifted apart'' and People magazine claimed their romance was ''on the rocks''.

It seems the rumours stem from the busy pair - who got engaged in 2011 and have two-year-old son Bingham together, as well as raising Kate's 10-year-old son Ryder from a previous relationship - not being photographed together since December.

Kate recently admitted she was keen to walk down the aisle with 'Supermassive Black Hole' singer Matt, saying: ''I look forward to [our wedding]. We'll both figure it out. We've been both very busy, but it will happen.''