2004 BMW 325 Squeeky suspension, but only when getting in/o

In the last couple of weeks I have noticed that the suspension of my 04 BMW 325i is squeaky. It does not squeak when being driven(even on speed bumps) but every time someone enters the passenger or even the driver's door and sits down a series of squeaks are heard. The suspension seems fine when driven and if I push the car down it returns to its original position slowly and with stability so with that said I don't really think its a huge issue but it its quite embarrassing to have a BMW that makes such noises when someone gets in. Also, when I brake hard, it remains in a straight line and no noises are present.