New York, Mar 22 - Lady Gaga's sister has been revealed to have a more sedate dressing sense, preferring to dress down rather than up like her sibling.

Natali Germanotta, 18, who had a cameo in Gaga's new "Telephone" video, showed up to her own birthday dinner at Sazon in TriBeCa in an understated, elegant black frock.

"She dresses and acts nothing like Lady Gaga," the New York Post quoted a source as saying.

"Everyone stuck to soda because they were all under 21. They were all very polite," the source added.

She has reportedly been taking vocal lessons in hopes of joining Gaga as a backup singer. (ANI)