The 'Home' singer's little boy is set to undergo treatment for liver cancer.
Watch Robbie Williams Surprise Fans With Take That Reunion On Stage!
He's been saying that a Take That reunion won't be happening any time soon. It looks like he's been having us on!
Recently he's repeatedly said that he'd love to do a Take That reunion but his newly announced tour, The Heavy Entertainment Show, meant that the dates clashed.
Which is why the crowds were left screaming with delight when he brought the remaining three members of Take That on stage at a special gig for the BRITs.
The crowds had no idea that Gary Barlow, Howard Donald and Mark Owen would join their former bandmate to perform their hits The Flood and Back For Good.
Howard even joked: "Rob, whether you like it or not, you will always be a member of Take That!"
Robbie, 42, was joined by his glamorous wife Ayda Field, 37, for the awards ceremony where he scooped the BRITs Icon Award.
Robbie left Take That in 1995 to embark on a solo career. The rest of the band, including Jason Orange, reunited in 2006 without Robbie, until Jason left in 2014.
It's not the first time Robbie has reunited with the boys as he joined them for a few gigs on their Progress album tour in 2010.
Robbie Williams has won 18 BRIT Awards throughout his career, in particular the British Male Solo Artist Award which he has picked up seven times.
The star headed straight from the jungle to panto...but clearly hadn't had time to learn her lines!