Solange Knowles has cancelled her European tour dates.

The 'Losing You' singer - the younger sister of Beyoncé Knowles - has issued an apology to her devoted fans after she decided scrap her summer festival performances in order to spend more time with her family and work on her upcoming album.

Writing on the website of the Belgian music festival Pukkelpop, she said: ''I am completely devastated to announce that I will be cancelling my international festival dates for the summer.

''I wish I could put in words how much of a difficult decision this was ... but between moving part time to a new city, starting my son in a new school, and writing/ recording my new record ... I really had to make the best decision for my mental/physical health and provide some stability for my family.

''I am so so sooooo sorry if I've disappointed...... and really hope to make it out to those special cities soon enough! (sic)''

The 27-year-old star has an eight-year-old son Daniel - with her ex-husband Daniel Smith.

Solange launched her own record label, Saint Records, two months ago under the umbrella of Sony, which will allow her to release her own music with complete creative freedom as well as promoting other artists.

She has only recorded two full albums to date, 'Solo Star' in 2003 and 2008's 'Sol-Angel and the Hadley St. Dreams', but is eyeing up a 2013 release date for her next offering.