<text>  Former Arsenal captain Thierry Henry has got fans guessing after posting picture of himself alongside singer-songwriter Robbie Williams on Twitter, cryptically promising something special ahead of Red Nose Day 2015. The biennial television charity appeal, which is part of the wider Comic Relief campaign, is set to air this year on March 13. Williams, who has had UK No 1 singles with Millennium and Rock DJ, has taken part in previous Red Nose Day shows, and famously appeared dressed as a woman with Matt Lucas and David Walliams of the hit comedy series Little Britain in 2009. Thierry Henry poses with singer-songwriter Robbie Williams left ahead of Red Nose Day . The Frenchman is Arsenals all-time leading goalscorer, netting 228 times for the north-London club . Williams centre appears with Little Britains Matt Lucas left and David Walliams for Comic Relief in 2009 . It remains to be seen whether Henry, who retired from playing football last year, will be prepared to try something as daring. Since hanging up his boots, Arsenals all-time leading goalscorer, has been working as a pundit for Sky Sports and taking the first steps into coaching, juggling a part-time role with the north London clubs youth development teams. Henry is known to support a number of humanitarian causes and is an ambassador for the childrens charity, UNICEF. Henry makes a point to fellow Sky Sports pundit Glenn Hoddle right ahead of the League Cup final . Williams performs at the Bambi Awards back in 2013 at the Stage Theatre in Berlin, Germany . Henry scores a penalty for Arsenal during the Premier League game against Charlton Athletic in 2007 . 