Louis invites yet another famous person to join 1D.
Well, if he wants to he can experience worldwide fame as part of a boyband once more - thanks to Louis Tomlinson.
Yep, after being told about Robbie's comments while being interviewed by Capital FM, Luigi said: "That is amazing. We are actually massive fans of Robbie Williams. And after singing on the show with him and stuff.
"He can join us anytime. [The] invitation is there."
Zayn seemed to agree with the sentiment, adding: "He can join whenever he wants - he knows that. It's cool."
Captain Sassypants can't seem to resist asking people to join the band - James Cordon joked he would be replacing Zayn earlier this year after Louis asked him to become a sixth member via twitter.
Phew, at this rate Uncle Simon's going to have to fork out for a bigger tour bus.
The 1D lads already have experience of performing with Robbie too - the former Take That member joined them onstage for The X Factor final back in 2010.
What do you think - can you see Robbie as the sixth member of One Direction?