Lady GaGa has wished her ''hero'' Taylor Kinney a happy birthday.

The 'Applause' hitmaker posted a message to her boyfriend on Twitter yesterday (15.07.14) to wish him all the best on his big day as he celebrated turning 33.

She tweeted: ''Happy Birthday to my darling @TaylorKinney11 he plays a hero on TV but in real life he's my Hero.''

The 'Chicago Fire' actor also took to Twitter to thank his fans for their kind messages, and wished a happy birthday to anyone who happened to be celebrating their own milestone.

He wrote: ''Thank you all! Lots of love ... If anyone else has a B-day today, happy happy! Here comes the sun. God bless.''

While Gaga described him as her ''hero'', Taylor called his girlfriend an inspiration earlier this year and insisted their relationship works because they believe in each other.

He previously said: ''It's someone who's always in your corner, that believes in you and your work, and vice versa.

''You know, I love what she does and her work and music and charity. She inspires so many people including myself.''