Beyoncé's younger sister Solange Knowles cancels European tour dates citing her 'mental and physical health'

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 to scrap her summer festival performances in order to spend more time with her family and work on her upcoming album.

Writing on her website, the 27-year old said: 'I am completely devastated to announce that I will be cancelling my international festival dates for the summer.

Pooped: Singer Solange Knowles, 27, Beyoncé's younger sister,  cancels her European tour dates citing her mental and physical health. She did manage to catch the premiere of Woody Allen's Blue Jasmine at the Museum of Modern Art on Monday night

'I wish I could put in words how much of a difficult decision this was,' she posted on her site on Wednesday. '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!'

Solange managed to performed at the 2013 Pitchfork Music Festival at Union Park in Chicago on Sunday after being named the New face of Max Mara Accessories event last Thursday in New York.

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

Too busy: Solange performed at the 2013 Pitchfork Music Festival at Union Park in Chicago on Sunday after being named the New face of Max Mara Accessories at an event last Thursday in New York

Family time: A more relaxed mom wore a pretty red and blue paisley dress and her son Daniel in a blue shirt with yellow pants and a pair of grey boat shoes at the Stella McCartney Spring show last summer

She 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.

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

She recently moved from Los Angeles to New York and is currently in a relationship with music video director Alan Ferguson.

Time out: Solange wants to spend more time with her boyfriend Alan Ferguson and her son. She attended the Blue Jasmine premiere in a mint-coloured silk mini skirt and tunic with a well-suited Alan on Monday