Amber Rose's son is ''the size of a six month old''.

The 29-year-old model and her fiance, rapper Wiz Khalifa, welcomed their first child, Sebastian Taylor Thomaz, in February and Amber says he is growing very fast and is already larger than the average baby.

Speaking on the red carpet at the BET Awards 2013 on Sunday (30.06.13), she exclusively told BANG Showbiz: ''Motherhood is amazing, I'm so happy. He's big, he's like the size of a six month old. The doctor says he's above average, he's going to be tall like the both of us.''

Proud father Wiz - who stands at 6' 3'' tall - is completely besotted with the tot and admitted he just spends his time trying to make Sebastian smile.

He said: ''He just kills us with his smile, we do whatever we can to make him smile.''

Amber, who is 5' 8'', and Wiz are also finally preparing to wed, after heading to a Los Angeles courthouse yesterday (02.07.13) for their marriage licence. Once they receive it, they will have 90 days to wed before it expires.

The couple became engaged in March last year and Amber has been excited about it ever since.

She said last year: ''I think about it constantly. Like all day. No matter what I'm doing I always have my wedding on my mind. So I'm really excited.''

The BET Awards 2013 aired in the UK last night on Sky 187, Virgin 184 and Freesat 140 and will now be available on demand.