Shawn Mendes has gone Instagram official with girlfriend Bruna Marquezine, posting a birthday tribute to the Brazilian model and actress on Tuesday, August 4, as she turned 31. The post — live on Mendes's Instagram — marks the first time the 27-year-old singer has publicly confirmed the relationship.

"Feliz aniversário my baby," Mendes wrote, opening the caption in a mix of Portuguese and English before telling Marquezine: "you've truly changed my life." He added, "You are a light and a mãe in every room you walk into" — mãe being the Portuguese word for mother, used here as a term of warmth and care. The caption closed with "Eu te amo muito muito muitoo," meaning "I love you so, so, so much" (Billboard).

The post's imagery went beyond the usual couple snapshots. Mendes included footage from a visit the pair made to Casa Amarela Providência, a cultural centre in Rio de Janeiro's oldest favela, Providência, which runs artistic and cultural programmes for local children (Billboard).

Mendes and Marquezine were first rumoured to be dating in December 2025 (Yahoo Canada). Billboard reported the two began dating in December. They have since been seen together in both Brazil and the United States, though Tuesday's post is the first public confirmation from either of them (Yahoo Canada; People).

People magazine and JustJared both independently reported that Mendes went public with the relationship on Marquezine's 31st birthday (People; JustJared).

For Mendes, the post is a notable shift into public view. The Canadian singer previously dated Camila Cabello, his duet partner on the 2019 hit "Señorita," in an on-off relationship that lasted from 2019 to 2023 (Billboard). His fifth studio album, Shawn, was released in November 2024 and debuted at No. 26 on the Billboard 200, the chart that ranks the most consumed albums in the US each week across sales and streaming (Billboard).

Marquezine, born in Duque de Caxias, Rio de Janeiro, has been a presence on Brazilian screens since childhood, with roles across telenovelas and film. The birthday tribute paired personal celebration with a shared cultural outing — a gesture that, for followers on both sides of the Americas, put a face to a relationship that had until now stayed off the grid.