Beyoncé Knowles will give away her latest fragrance for free at her New York show.The 'Crazy In Love' singer is launching Diamonds - a new perfume with Emporio Armani - at her Madison Square Garden concert today.Twenty "brand ambassadors" will be at the show to give out free samples of Diamonds to the audience.The 25-year-old - who has already leant her name several fragrances produced by designer Tommy Hilfiger - recently fell down a flight of stairs during a concert. Beyoncé was performing her hit 'Ring the Alarm' in Orlando on July 24 when she lost her balance and crashed down a dozen steps, dropping her microphone which slid across the stage. But Beyoncé - who was wearing a trench coat and high heels for the song -quickly grabbed the microphone, sprang to her feet and began singing again,barely missing a beat.When she had finished singing, the star joked: "Don't put it on YouTube!"Beyoncé previously claimed dancing in heels is "easy", but admits she does find it difficult to dance and sing at the same time. She said: "The easiest part is dancing in the heels. I don't even think about it anymore, it's just second nature."But it is difficult to dance and sing at the same time. I have to make sure I'm in shape and I'm hydrated."