Mutya Keisha Siobhan have admitted that they have been sent hate mail because their debut album hasn't been released yet.

The group, who consist of the original three Sugababes members, have been working on their maiden album for a number of months.

It seems, however, that some fans are growing impatient at the lack of information surrounding the record's release.

Siobhan Donaghy told NME: "We have an announcement coming shortly. I can't tell you, but it's great news. It's been majorly frustrating - we've literally been starting to get a bit of hate mail about it. The album's been finished for a long time. It's fantastic."

MKS have so far released one single, 2013's 'Flatline', which reached No.50 in the UK.

Watch MKS perform live below: