Speaking to People magazine, she said: "I was humiliated when I watched it back".
"On Sunday night (07Jan18), the Heartbreaker singer detailed on social media how she had accidentally stolen the Oscar-winning actress" seat when she took too long mingling after heading to the bathroom during a commercial break.
Other guests at Streep's power table included Tom Hanks, Rita Wilson, Kate Capshaw (Steven Spielberg's wife), Stacey Snider (head of 20th Century Fox) and The Post producers Amy Pascal and Kristie Macosko Krieger.
Luckily for Mariah, Meryl saw the amusing side.
Mariah first revealed the news of the seat mix up on Twitter, apologizing profusely and saying: 'You can take my seat any time!'
The singer offered her version of what happened next. Leave it to Streep, however, to craft a creative solution so both she and Mariah could sit.
Clarkson attended the ceremony to present, with Keith Urban, for the Best Original Song award.
"I love everyone but I've just adored you since i was eight!" she screamed at the actress. I was like 'Oh God! Fashion.ie takes no responsibility or liability for any transaction between user and each fashion vendor. Fashion.ie would also advise all users to check for the correct sizes of items as well as delivery and returns policy of each vendor prior to purchasing items from them.