Ross was supposed to have lunch with her daughter at the posh Italian eatery, but the diva arrived ahead of her daughter who had made the reservation and the delay turned out to be the cause of the troubles that transpired soon after, reported Aceshowbiz.
Ross had asked to be seated but was denied based on the eatery's policy that guests won't be allowed seating unless the complete parties arrived or they had a reservation.
In spite of being refused seating, Ross still went inside of the restaurant and sat in a corner.
The manager then approached her to explain La Scala's seating policy, asking her to comply, explaining further that if she cuts the line, she will not be served by the dining staff.
But Ross didn't leave and instead waited for her daughter to arrive before she threw a hissy fit, ending up with both mother and daughter leaving the place altogether.
Gigi Leon, owner of La Scala, has released a statement in light of the incident, saying, "I'm sorry that Miss Ross had a problem with that and she feels that the rules didn't apply to her. Our policy is that we don't sit incomplete parties.
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"If people jump the line, our policy is we don't serve them, and she was told that. We treat everyone the same whether you're famous or not. We love having her as a customer. We'd be happy to have her back."
This was not the first time the multi-awarded artist made a scene for not receiving VIP treatment. In 2009, Ross fumed mad at the same La Scala resto when she joined her children's table for lunch but her request for an extra chair was not accommodated since there was no longer any room at their table.