Hailee Steinfeld reveals the NAME of her newborn daughter with NFL star husband Josh Allen... two months after giving birth

Hailee Steinfeld revealed the name of her baby girl after welcoming her first child with Josh Allen two months ago.

The Sinners star, 29, who gave birth on April 2, shared their daughter's name - Harper Haize Allen - in her latest Beau Society newsletter released on Friday.

She opened up about becoming a mother for the first time as she penned a gushing letter to her 'sweet girl.' 

Steinfeld has been in a relationship with the Buffalo Bills quarterback, 30, for three years and they got married last May in Santa Barbara, California.

In the newsletter addressed to her daughter, Steinfeld reflected on the couple's first few months of parenthood, which she described as being both 'beautiful and exhausting' as well as 'sacred and so special.'

After becoming a mother, Steinfeld said she 'no longer [measures] time in months or years.'

While adjusting to life with a newborn baby, she said she now experiences life 'in ounces, naps missed and naps miraculously taken, in diaper changes, and the quiet triumph of a successful transfer from my arms to your crib.' 

'Dearest Harper, I'm in awe of you,' she began in her newsletter. 'You've been here for only a short while now, and somehow it feels as though you've always been ours. There are moments (like right now, as you sleep so soundly on my chest), I still look at you and wonder how you're real. 

'These last few months have been beautiful and exhausting. Sacred and so special. The longest days and the shortest season all at once,' she added.

'People tell you becoming a mother changes everything, but no one tells you how, why, or when exactly. It isn't always in the big moments,' she continued. 

'Sometimes it's realizing that I no longer measure time in months or years, but in ounces, naps missed and naps miraculously taken, in diaper changes, and the quiet triumph of a successful transfer from my arms to your crib. 

'Your daddy and I look at you often and ask each other the same question: How did we get so lucky to have you? You, whose tiny fingers already wrap around mine with a trust I pray I never take for granted. You, whose dad is officially outnumbered when it comes to choosing a movie for movie night, though I suspect he'll secretly love every minute of it.'

She went on to write: 'Everyone tells me not to blink. Now I understand why. Because already, I miss versions of you that still feel like yesterday: The way you'd make sure we'd have multiple visits throughout the night, the impossibly small diapers we swore looked enormous before you arrived. 

'Before I was a mother, I had never understood this feeling of being so wistful and filled with excitement at the same time,' she gushed. 

'I want your baby hair to stay this soft forever, but I long for the day you might ask me to braid it down your back while we're sitting in the grass. I could tear up at the thought of your tiny toes getting bigger, but I know that someday your big-girl feet will carry you through this big world.'

She ended her newsletter by sharing how she has changed after giving birth to her and Allen's first child, writing about how her infant daughter has already 'taught [her] far more than [she] could ever teach [Harper].' 

'It's funny, I used to think motherhood was about raising a child. But now, I think being a mother is actually about allowing yourself to become someone new over and over again,' Steinfeld wrote.

'Each day with you, I meet a different version of myself. A softer version. A stronger version. A more patient and present version. A version that loves everything and everyone — including myself — more deeply than she ever knew possible.'

She continued: 'I've learned that motherhood isn't made up of grand moments as much as the tiny, precious ones. 

'The sway of tired hips in the middle of the night, your little milk-drunk smiles, and the quiet realization, over and over again, that my heart is now somehow living outside of my body and it always will,' she added.

'And even though I know I am meant to guide you through this life, Harper Haize Allen, the truth is that already, you have taught me far more than I could ever teach you.'

In some of her other recent newsletters, she opened up about her postpartum journey and gushed about celebrating her first Mother's Day as a parent. 

Steinfeld and Allen were first romantically linked in May 2023, got engaged the following year and tied the knot the next summer. 

The couple announced her pregnancy just a few months later, in October 2025. 

The Oscar nominee credited her 'amazing doula' for helping to take care of her after giving birth. 

'In general, she advised me to stick to warm foods during my postpartum recovery to help digestion and boost nutrient absorption, a philosophy that stems from Ayurveda,' Steinfeld shared. 

'Knowing this, my mom made me this amazing albondigas soup the other day. It's one of those rare soups that looks as good as it tastes,' she added. 

She also said that she is still in an 'early period' after giving birth and has to 'be super gentle' with herself.