Lottie Moss moving in with Alex Mytton?

Supermodel Kate Moss' sister Lottie and her boyfriend Alex Mytton are reportedly taking their relationship to the next level by moving in together.

The 19-year-old model and Mytton, 25, who have only been dating for four months, are apparently getting serious about their relationship, reportedly Femalefirst.

The big commitment came after they spent time together on a romantic getaway in Barbados.

"Lottie and Alex have grown closer in recent months. They loved spending time together in Barbados and sharing a place is the next step," a source said.

Lottie started seeing Alex weeks after her split from Sam Prince.