<human>: So  friend had her bachelorette party last night and it was a lot of fun. We did a wine and painting night and then a limo (paid for by bride's mother) took us to different bars. It was a lot of fun and no one had to worry about being DD. However, when the night drew to a close the bride was very drunk. We were getting her  the limo, and the driver talks to me (probably the most coherent and sober of the group). Who's taking care of paying/tip? I tell him bride's mother. He asks if MOB will be at their destination, and I know that it's 99% certain she won't. He looks disheartened and mentioned no one took care of the tip. I used to live off tips as a server and I felt for the guy. I asked him how much it normally is and he said $75 just for tip. I had $50 and that's what I gave him. 

Now, looking back I'm wondering if I did the right thing. I had the fleeting thought that he might be being dishonest  the moment, but I also felt wrong saying 'it's not  problem' and sending him packing. Should I bring this up to the bride's mom? I don't want to stress out the bride, but I'd have to get the mom's number from the bride so she'd likely end up asking why I needed to talk to her mom. If MOB had already paid/tipped and I got ripped off I only want to get the limo companys info so I can call and report it and perhaps get refunded.

Condense the text into a few key points
<bot>: I may have gotten scammed into unnecessarily tipping a limo driver at  friend's bacholerette party. Should I try to starighten it out or let it go?