The 25-year-old star – who recently opened her own vintage clothing store Lucy In Disguise with her sister Sarah Owen – is expecting her first child with boyfriend Sam Cooper next year.
Writing on Twitter, Allen said: 'I'm going to take a walk now. Off to my solicitor’s to sign more papers, then a spot of shopping. Still can't really face maternity clothes.'
Her sister Sarah recently revealed that the It’s Not Fair singer has been helping her run the shop from her bed because of her morning sickness.