She famously swerved the Band Aid 30 single last month, and it looks like even a good friend's wedding can't lure Adele out of the house right now.

Sir Elton John officially became husband and husband with his long-term partner David Furnish at the weekend - holding an intimate ceremony at their Windsor estate.

[related]But it looks like his chart-topping mate Adele was a no-show, because he's shared a snap of her apology note on Instagram.

Her handwritten letter reads: "Biggest congratulations my loves. Have a wonderful day. I'm sorry we are not there. See you in 2015. Love Adele, Simon and Angelo x."

The pop legend joined the social network in order to share his big day with the world.

He captioned the pic of cards and notes: "The perfect end to a perfect day. So many kind thought and wishes #sharethelove."