Kate Moss is reportedly being very strict with her younger sister, and aspiring model, Lottie saying she needs to focus on her education.

The source told The Sun that the supermodel has been giving Lottie advice in the run up to her GCSE exams: "Kate can't help with the maths and chemistry because she says she's rubbish at it.

"But she's given Lottie the ultimate exam advice and told her no boys and no sneaking out of the house until the tests are over."

The source added: "She always told Lottie that education is crucial. Kate wants her to finish school and then decide how much modelling she wants to do."

Lottie was signed to Storm Model Management on her 16th birthday in January. She was first spotted when she was 13 as a bridesmaid at Kate's wedding to Jamie Hince.