The former Take That star confessed that he is "jealous" of One Direction's current success and wants to join them for the ride.
Reacting to the claim, Liam Payne told Capital FM: "That is amazing. We are actually massive fans of Robbie Williams. And after singing on the show with him and stuff."
Louis Tomlinson continued: "He can join us anytime. [The] invitation is there."
Zayn Malik added: "He can join whenever he wants - he knows that. It's cool."
One Direction premiered the music video for their new single 'Live While We're Young' yesterday (September 20) after the clip leaked online ahead of its original debut.
The boyband's second studio album Take Me Home will be released in the UK on November 12 and a day later in the US.
Watch the music video for One Direction's 'Live While We're Young' below: