The girl, identified as Clementine, was reported missing from her home in Twickenham on Thursday, April 21.
She was previously seen earlier that day.
Met Police officers have launched an appeal for information and are continuing to investigate
A photo of Clementine, who is white, of slim build, with blonde hair and wearing a white vest with a black tick, has been released.
She is also pictured with a black crossbody bag strap.
Stars including singer Sophie Ellis-Bextor, actress Georgia Tennant, podcaster Deborah Frances-White and broadcaster James O’Brien have shared the appeal to find Clementine.
Detectives believe she may be in the company of friends, and potentially in the Acton area.
A spokesperson from Richmond Met Police posted on Twitter this morning (Saturday, April 23) a statement which read: “Just been in a meeting about this and officers are searching as they have been last night.
“We’ll bring you all updates as we get them.
“Please continue to share / RT / assist us in getting Clementine home safe.”
Anyone with information on her whereabouts is asked to call 101, providing the reference 22MIS013222.