Lena Dunham and Jack Antonoff risk awkward run-in at Taylor Swift's wedding after cheating admission

Taylor Swift and Travis Kelce's mega wedding celebrations may play host to a wince-inducing reunion.

Alongside sparkling guests such as Selena Gomez, Emma Stone, Zoë Kravitz, Stevie Nicks, Haim, Suki Waterhouse, Graham Norton and Ed Sheeran, ex-couple Lena Dunham and Jack Antonoff will be in attendance today (July 3) at Madison Square Garden.

Best known as the creator and star of HBO comedy-drama Girls, Dunham and musician Antonoff were an item for five years until 2017.

The former is a longtime friend of pop sensation Swift, while her ex has worked as one of the 'Cruel Summer' singer's primary collaborators since 2014.

Dunham and Antonoff were pictured by paparazzi making their way to the New York City venue for the ceremonial rehearsal yesterday, but one previous confession regarding the era of their relationship has the potential to cause awkwardness.

Taylor Swift and Travis Kelce's wedding ceremony is happening in New York City this week (XNY/Star Max/GC Images)

That admission came from Dunham, specifically in her autobiography Famesick.

In the book, which was published only three months ago, the 40-year-old claimed Antonoff grew sick and tired of her due to the pain caused by Dunham's chronic illnesses, including endometriosis and Ehlers-Danlos Syndrome.

Citing one instance from November 2017, the memoirist recalled attempting to open up to him over her increasing reliance on pain medication, which allegedly prompted Antonoff to 'go to the bathroom and angrily flush all my pills down the toilet'.

"[This] necessitated a call to the doctor and a late-night trip to the pharmacy to get more so that I wouldn't go into withdrawal — from any one of the drugs — overnight," Dunham continued.

Lena Dunham and Jack Antonoff were together for five years in total (Jim Spellman/WireImage)

She then accused her former other-half of speaking to her in ways she'd 'never been spoken to' before, prompting Dunham to seek validation elsewhere.

This took the form of texting an old flame from school named Nick, and sleeping with him that very evening.

Despite this fault on her part, Dunham also suggested in Famesick that Antonoff may have been unfaithful during their relationship too, in that he'd at one point grown close to a 'teen popstar'.

"I wasn't paying attention, but the internet sure was," she wrote.

In the end, once Antonoff's 2017 tour came to a close, they both wept while telling one another that they were each other's first genuine love, before going their separate ways.

Both individuals have since moved on; Dunham tying the knot with another musician in Luis Felber four years later and Antonoff marrying The Substance actress Margaret Qualley in August 2023.