President Barack Obama said he felt honoured to take to the stage before Lady GaGa at a Human Rights Campaign dinner on Saturday.

The US leader told guests in Washington DC: "It's privilege to be here tonight to open for Lady Gaga. ... I've made it."

The comment came after the recent Nobel Prize winner pledged his “unwavering” commitment to end a ban on gay people from serving in the American military.

Lady GaGa performed an unusually coy set following Obama's speech, wearing a formal black dress.

Her performance included a specially edited version of former Beatle John Lennon's 'Imagine'.

On Sunday, the singer joined thousands of protesters on the National Equality March, which led calls for equality across America.

(by Jason Gregory)