I am close friends with celebrities my girlfriend doesn't know

I have a question I just got into a new relationship with a woman and she doesn't know that I am friends with real celebrities on Facebook I have met in person and she doesn't know about this these celebrities I have met in person are musicians and song artist one of them is name Mark Dawson lead singer for The Grass Roots how can I tell her about this celebrity I am close friends with my girlfriend may need to know the truth about these celebrities I have been friends with for a long time without a bad break ups