Dakota Johnson joins Lily Allen to play mistress ‘Madeline’ in ‘SNL’ performance

The other woman is here.

A lingerie-clad Dakota Johnson joined Lily Allen in a surprise “Saturday Night Live” performance to portray the mistress “Madeline.”

The “Fifty Shades of Grey” actress, who stunned in a sheer and lacy teddy dress from Bode ($900) and a sheer sequined duster coat, was mostly hidden behind a screen as Allen sang about the mistress on her new single, “Madeline.”

Johnson performed the spoken word part of the song, on which the “Smile” singer noted that she and her significant other “had an arrangement” in their relationship for them to “be discreet and don’t be blatant” while cheating.

“I hate that you’re in so much pain right now. I really don’t wanna be the cause of any upset,” Johnson said as she got off the bed and walked over to Allen.

“He told me that you were aware this was going on and that he had your full consent. If he’s lying about that, then please let me know. Because I have my own feelings about dishonesty,” she added.

“Lies are not something that I wanna get caught up in. You can reach out to me any time, by the way. If you need any more details, or you just need to vent, or anything. Love and light, Madeline.”

The “Madame Web” star, 36, then gave Allen, 40, a kiss on the cheek.

On the song “Madeline,” Allen sang about her estranged husband, David Harbour, breaking the rules in their “open” marriage.

The other woman was later revealed to be Natalie Tippett, a costume designer who met the “Stranger Things” actor, 50, while filming a movie in New Orleans in 2021.

For Halloween, Allen took a jab at Harbour by dressing up as the character Madeline from the beloved children’s book series.

In February, news broke that Allen, who married Harbour in 2020, and the actor were ending their marriage.

Allen filed for divorce in September.