Former MTV Asia VJ Denise Keller has a unique way of responding to people who don't believe she's Singaporean.According to a report in The New Paper, the 31-year-old is quite used to people mistaking her for a non-Singaporean. And when that happens, Ms Keller, who is of German and Chinese Singaporean descent, simply flashes her pink identity card. As a child, she had spent her holidays in Germany. She has modelled in Hong Kong and worked all over Asia when she was an MTV Asia VJ. Now, she produces and presents award-winning travel series Passage To Malaysia.She says there is one thing she has never doubted: That Singapore is home.