Jemima Khan not serious about Russell Brand?

Socialite Jemima Khan reportedly thinks that funnyman Russell Brand is not mature enough to be her boyfriend.
Khan, 39, is said to be dating the 38-year-old comedian since June but she is not keen on making their relationship serious, reported Contactmusic.
"They do get along great and have a lot in common, but she doesn't think he's mature enough for her to consider a serious relationship. And until he proves otherwise, she has said she can only see him on a casual basis," a source said.
However, Brand is in awe of Khan and keen to make their relationship an exclusive one.

"Russ surprised us all by how taken he is with Jemima. He's desperate to take things to the next level and make things exclusive. It's like he's addicted to her. She's described him as compulsive and obsessive and it's too much," the source added.
Brand was previously married to pop star Katy Perry whereas, Khan is the mother of two with former husband, Pakistani cricketer-politician Imran Khan.