The actress, 36, who has been in a relationship with the rapper, 32, since June 2020, posted a video in which she appeared to burn a letter in a bonfire, along with a bag.
She also uploaded a very raunchy string of mirror selfies while joined by a male pal, in which she put on a busty display in a plunging black top and cut-out trousers.
Megan wrote in her caption, ‘You can taste the dishonesty/ it’s all over your breath,’ which are lyrics from Beyoncé’s 2016 track, Pray You Catch Me, about her husband Jay Z’s own affair.
She then removed all traces of Machine Gun Kelly from her Instagram grid before deleting her account altogether.
The pair were last pictured together just hours before her shock post at Drake’s Super Bowl party in Scottsdale, Arizona.
Her followers flocked to the comments section to air their speculation, while noticing that she started following Eminem, one of only three people.
The Transformers star worked with The Real Slim Shady hitmaker back in 2010 when she starred in the music video for his single, Love The Way You Lie.
One devotee wrote: ‘If SHE got cheated on the rest of us really have no hope,’ while another added, ‘Deleted all photos of mgk and started following Eminem.’
More chimed in with, ‘OH MY GOD SHE TOOK DOWN ALL HER POSTS W MGK,’ and, ‘Are her and mgk still together im so confused?’
A fifth wrote: ‘LYRICS OFF THE LEMONADE ALBUM AFTER SHE FOUND OUT ABOUT JAYZ CHEATING I AM SCREAMING OMFG.’
Two more concluded, ‘Anyone else see she’s now following Eminem?!’ and, ‘She’s following only 3 ppl now and eminem is one!!’
Just four days ago, Megan shared a gushing tribute to her beau the day after the Grammys, where he had been nominated for Best Rock Album award for his record Mainstream Sellout.
MGK ultimately lost out to Ozzy Osbourne, but Megan praised her partner’s ‘humility and maturity’ in her lengthy tribute post.
She enthused that watching her MGK ‘become a better man is an immeasurably more satisfying experience than watching you accept an award.’
She also praised his ‘beautiful face,’ and promised to remind him of the night forever.
‘Congratulations on being in the very small percentage of artists who have received a Grammy nomination,’ Megan gushed.
‘You have handled this process with a grace and maturity that I haven’t seen from you before and I’m so proud of you.’
‘Watching you walk in humility and gratitude, watching you grow into yourself and become a better man is an immeasurably more satisfying experience than watching you accept an award.’
‘Although those will come… and this is irrelevant I guess but I will just never ever get over how beautiful your face is’
‘I hope one day you’ll see yourself the way I see you. I love you and I’ll keep this memory of you forever.’
In November when the nominees were announced, the rapper reacted to his own nomination, and penned on Instagram, ‘Call me what you want as long as it starts with ‘grammy nominated.’
The day before the Grammys, the Good Mourning actor reflected on his career and the upcoming ceremony on his Instagram story.
‘Just wanna say no matter what happens tomorrow, i am grateful to even have a tomorrow. see you at the Grammy’s..’
Megan meanwhile braved the star-studded event after revealing to her fans on Instagram earlier Saturday that she had both a ‘broken wrist’ on her right arm and also a ‘concussion.’
On the red carpet, the star opted to not wear a brace, despite the painful injury.
Megan hasn’t revealed any further details about the incident that caused the injuries, but was spotted sporting a hot pink brace on her right wrist as she posed inside the venue.
The couple went public with their relationship in June 2020, and announced their engagement last year in January 2022.
Megan shares three children with her ex-husband, Brian Austin Green. The two tied the knot in 2010, but their divorce was later finalized in October 2021.
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