Dina Lohan is fighting back against reports that she "dined and dashed" at an East Hampton charity dinner held over the weekend.

Lindsay's mom tells X17online exclusively:

    "Absolutely not true. Jill Zarin and I were asked to attend a charity event! The rest has nothing to do with us. We didn't run the event. We just attended."

According to reports, Dina was given four free tickets to the event, but after dinner, were given a $2,500 check.

A NY Post report claims, "They dined and dashed on a $2,500 check and didn’t leave a dime for the waiters. Organizers offered a reduced bill for around $1,100, but then they just upped and left without leaving a tip."

Dina adds, "This is completely bogus."