David Letterman sports a Santa beard on walk with his 11-year-old son Harry in New York City
- The 68-year-old retired as host of CBS' Late Show in May
- The new photos were taken just days after Letterman's next project was announced
- Letterman is set to travel to India next year to work on the National Geographic documentary series Years of Living Dangerously
David Letterman is nearly unrecognizable four months after quitting CBS' Late Show, thanks to his newly grown beard.
The facial hair made the retired late-night talk show host look a lot like Santa when he was pictured walking in New York City with his 11-year-old son Harry on Sunday.
While Letterman sometimes sported a beard in his 33 years on air, he always kept it short and neat for TV. But in retirement, it seems that Letterman has not been as diligent with his trimmer.
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Lazy Sunday: David Letterman sported a snowy beard when he went for a walk in New York City with his son Harry on Sunday
Father and son outing: Letterman retired from his position as host of CBS' Late Show four months ago. He was replaced by comedian Stephen Colbert
Letterman taped his final episode of the Late Show on May 20, and received send off by the five living presidents.
He was replaced by comedian Stephen Colbert, who took over the reins of the show earlier this month.
A huge 13.76 million viewers tuned in to watch the 68-year-old's emotional farewell.
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When Letterman announced his retirement in April 2014, he joked that he would be quitting so that 'Paul and I can be married' - a reference to his music director Paul Shaffer.
He hosted the Late Show for 22 years.
Before that, he was host of NBC's Late Night for 11 years. That makes him the longest-serving late-night talk show host in TV history.
Farewell: Letterman hosted his final episode of the Late Show on May 20, 2015. Pictured above during that final broadcast
While Letterman has barely started his retirement, it seems he is already antsy to get back to work.
Earlier this month, it was announced that Letterman would be appearing on the National Geographic channel's documentary series 'Years of Living Dangerously'.
Letterman will reportedly be traveling to India sometime next year to see how climate change is impacting the country for the series.
David Gelber and Joel Bach, the series' producers, told Variety that they reached out to Letterman because he always showed an interest in profiling the issues of climate change on the Late Show.
'You could just tell. Whenever they would have a climate discussion, he would really kind of perk up,' Bach said, 'And it turns out he does, he cares about it a lot. He’s definitely invested in this issue.'
The documentary series will be Letterman's first project since retiring from the Late Show.
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