Chelsy DavyChelsy DavyChelsy Davy may have been singing her boyf a tune.

And it goes a something like this...

Happy birthday to you,

Happy birthday to you,

Happy birthday dear Prince Harryyyy.

Happy birthday to you.

Yep, you guessed it, Hazza celebrated his day of birth, a whole 23 years ago.

And it comes as no surprise that he spent it with his mates and his lady love, Chelsy.

It appears they all had a jolly good knees-up.

The booze was flowing, while the b'day cake was out for all, down at the Vine Tree pub, near Highgrove, Gloucester, on Saturday night.

One guest at the bash told the Daily Mirror: "Harry went to the bar every five minutes to get another round."

Chelsy with Prince HarryChelsy and Prince HarryWhat a generous chap.

But don't think he forgot Chelsy - even though he held back on the PDAs (unlike his big bro William, who couldn't keep his hands off Kate Middleton, we hear.)

Hazza later declared his love for Chelsy in a sweet speech.

The insider added: "He gave a speech on her move to the UK and said it was the best birthday present he could get."

Bless.