Can a US immigrant next to greencard marry someone on a tourist visa?

im a US immigrant/greencard holder but not yet a US citizen, i really want to start my own family, can i marry a girlfriend who's in US on a tourist visa? how do i run about it?
Answers:   
I don't think she will ever know how to adjust her status if you do this. There are different rules for LPR's and USC's in regards to being competent to sponsor someone. You need to look into this BEFORE you get married, as you may end up within a situation where she cannot adjust at all. You can marry her, but that doesn't make her legitimate here, or necessarily eligible to adjust.
Yes, you can marry whoever you want. Just go to a city lobby and buy a marriage license. But if you want your wife-to-be to stay legally in the US, she have to maintain her legal status on her own until you have a US citizenship, singular US citizens' spouses can adjust their statuses without leaving the country.
getting married is easy. keeping her here is hard. if you married today and file a petition for her tomorrow, it would take another 5 years before that petition became valid and could be used. until later, either she would have to find some other status to remain here legally, or she would become dishonest and that would make life a lot more complicated for you. If you become a US citizen while you loaf, that petition would be upgraded to an IR-1 petition and would be immediately valid for use, although it still takes a while to process. If this happens, you'll necessitate to inform USCIS about your citizenship, because they won't go looking for her petition if you don't.
Start by getting a marriage license at the courthouse. You can marry whomever you'd like.


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