The Wanted were thrilled to perform at Romeo Beckham's 10th birthday party on Saturday (01.09.12).
The youngster's mother Victoria Beckham asked the boy band to surprise Romeo at his bash in the US and the group - who were in Los Angeles anyway - were happy to oblige.
A source told The Sun newspaper: ''Victoria has some handy connections with the band and it wasn't hard to get them along.
''The lads are in the States anyway preparing for the MTV VMAS on Thursday and were happy to pop over.
''They met all Romeo's pals and posed for snaps. It's the easiest gig they've ever had.''
Victoria tweeted the band to show her appreciation, writing: ''The @thewantedmusic boys, the coolest boys in music!!! Thank you for making Romeo's 10th birthday so special!!!! X vb (sic).''
The group were quick to reply with Siva Kansewaran writing ''absolute pleasure x''.
Max George also thanked Victoria - who is married to David Beckham - for a ''lovely day''.
He wrote: ''hey, thanks for a lovely day yesterday ... Hope Romeo had the best birthday ever! X (sic).''