Celebrity dreams are common and reflect your feelings about your social status. When a celebrity treats you well in a dream, it reflects your sense of confidence that you are worthy of and deserve their attention. Here's a link to the definition on this site:
dreamdoctor.com/dream-dictionary/definitions/celebrity.html
Then, in walks a girl, who you sense is your friend and she is pregnant. For some reason, her identity is concealed from you in the dream, but odds are that she is someone you know. Pregnancy in dreams is also often symbolic. Here's a link to its definition:
dreamdoctor.com/dream-dictionary/definitions/pregnant.html Then, she has the baby, which is also a common dream symbol. Here's a link to what it means:
dreamdoctor.com/dream-dictionary/definitions/baby.html
This dream is all about your social scene. You were feeling very good about yourself at the start of the dream, good enough to hang with a celebrity. Then, a girl friend enters the picture, someone who is "pregnant" with something (could be new romantic relationship, position, or accomplishment) that steals focus from you. Given the context, the celebrity could be someone in your waking life who you have elevated to celebrity status, such as (excuse the stereotype) the captain of the football team. Bottom line, you perceive your "friend" to "have something special" which causes you to feel and even accept the fact that you are "less than" her in the eyes of the "celebrity."
Feelings in dreams are never disguised. So, how you feel in your dream is how you feel about its subject in your waking life. First, you are happy (he gives you attention), then hurt (you feel upstaged), then abandoned (he cares more about her), then numb (you give up on him.) If you don't feel that this symbolic scenario relates to anything that has happened to you recently in your waking life, try to identify where you have had those feelings and you will know what your dream is about. It's hard to say conclusively without knowing what was going on in your waking life, but odds are that it's about a romantic interest or crush that you had, one that you felt was extinguished by friend who consciously or not stole his attention from you.
Whatever it is, you don't have to just take it. Assert the best of yourself without concern for what other have and before long the light will find you again... as will the "celebrities."
Good luck!