Mary-Kate and Ashley Olsen have an extra reason to celebrate this year. Just days before the famous twins mark their 40th birthday on June 13, exciting family news has emerged that their younger sister, Elizabeth Olsen, is expecting her first child with husband Robbie Arnett.

The Marvel star, 37, was seen appearing to cradle her growing baby bump during a lunch outing at All Time restaurant in Los Angeles.

For Mary-Kate and Ashley, the happy announcement marks another special chapter for the famously close-knit Olsen family.

A joyful family milestone

Elizabeth has largely kept her relationship with musician Robbie out of the spotlight since they first began dating in 2017.

The couple reportedly met through mutual friends while vacationing in Mexico and made their public debut later that year. They moved in together in 2018, sparking engagement speculation before quietly tying the knot ahead of the coronavirus pandemic.

“We eloped and then we had a wedding at another time,” Elizabeth revealed during an appearance on The Jess Cagle Show in 2022. “It was before COVID.”

Now, the actress is preparing for a new role: motherhood. The pregnancy news comes after Elizabeth previously opened up about balancing family ambitions with her thriving Hollywood career.

Speaking on SiriusXM in 2021, she candidly reflected on the challenges of timing parenthood around work commitments.

“At what point do I get pregnant? At what point do I have my first baby?” she said. “Is that five years from now? Because then I only have this kind of a window.”

Growing up as the youngest Olsen

While Elizabeth has become a star in her own right through blockbuster roles including Wanda Maximoff in the Marvel Cinematic Universe, she has often spoken about growing up alongside her world-famous sisters.

Mary-Kate and Ashley became household names as toddlers playing Michelle Tanner on Full House before building a hugely successful entertainment empire and, later, a luxury fashion business with their label, The Row.

Despite their extraordinary fame, Elizabeth says family has always come first. Speaking to The Times earlier this year, she reflected on her childhood growing up with her older siblings.

“They were forced to watch all my plays my whole life and go to my dance performances,” she recalled.

Asked whether her sisters had offered career advice over the years, Elizabeth downplayed the idea. “No. We’re just a supportive family,” she said. “It feels irrelevant to talk about it after 15 years of working.”

A milestone birthday for the twins

The baby news arrives as Mary-Kate and Ashley prepare to celebrate a significant birthday milestone.

The notoriously private sisters have largely stepped away from the spotlight in recent years, focusing on their hugely successful fashion careers and avoiding the celebrity circuit that once defined their childhoods.

Now regarded as two of the most influential figures in luxury fashion, the twins are known for keeping family matters private.

Still, Elizabeth’s pregnancy announcement is sure to make this year’s birthday celebrations even more meaningful.

As the Olsen family prepares to welcome its newest member later this summer, there is little doubt that Mary-Kate and Ashley will be celebrating more than just turning 40.