The special one-off programme, which airs next week, will celebrate the broadcaster’s illustrious 60-year career, and Prince William has recorded a birthday message for Sir David.
In it, he says (via Radio Times): “When I was a young boy I used to love turning on the television and watching David’s programmes and really feeling like I was, either back out in Africa or I was learning about something magical and almost out of this planet.
“There’s something very calming and sort of warm about his programmes, there’s something very reassuring about seeing David Attenborough on BBC1 doing his documentaries.”
David Cameron has also filmed a segment for the show, in which he adds: “Like so many, I grew up watching you and learning from you as your enthusiasm opened my eyes to the natural world around me.
"Your lifelong service has created the most extraordinary educational legacy and even today you’re pioneering the latest technologies. Britain is incredibly proud to have the greatest naturalist on the planet, for just as you treasure the world so the world, rightly, treasures you.”
'Inspiring David: Attenborough At 90' sees the broadcaster sit down with Kirsty Young to discuss his many triumphs.
Earlier this week, David admitted that things don’t always go smoothly though, opening up about what he considers to be the low point of his career.
‘Attenborough At 90’ is on BBC1 at 7pm, on Sunday 8th May.