Is it immature to be jealous of a celebrity your girlfriend is kind of in strong "like" with?

[Old Man River]

Like I know girls have their celebrity crushes and all but what if it gets to the point where for instance their asking questions on here like "Does anyone know if this celebrity is single? What type of girls does he like?" and all this other stuff like whats his favorite food and she hardly ask stuff about me and doesn't seem to want to even know me that deep. I mean started a twitter page to follow him (and when i tried to get her to make one with me she said whats the point until she found the celebrities she likes) she even spreads the word to other friends and likes all the facebook pages. I know she loves me but i feel like I don't have those qualities and looks she likes in celebrities. I feel like if the celebrity liked her she would leave me.... I guess I just want to feel like a celebrity in her eyes sometimes.... I know this gay and over emotional for a guy but give me input please