It's been 45 days since Hugh Grant welcomed his little girl with former partner Tinlang Hong. 

But it seems the About A Boy star forgot to file some very important paperwork, after failing to register the baby's birth. 

Parents are legally obliged to register a new arrival within 42 days – or face a fine of up to £200.

But neither the actor nor Tinlang have made their child's birth official since she arrived on 26 September.

A registry office worker said: "It hasn't been registered yet."

"It is appointment only to register a birth and there is no appointment."

However, despite their no-show, it's unlikely that the pair are going to be in deep trouble.

"It is quite common to go over 42 days," added the source.

"We've got some as long three months."

"The main thing is that we maintain communication with the parents - and it's not like we are going to turn up on his doorstep with the police and chase them up."  

Photo: © Getty