Is Ariana Grande engaged to her rapper boyfriend Mac Miller? On Sunday, the "Side to Side" singer led an armful of celebrities who performed for "One Love Manchester" benefit concert in front of thousands of people. Interestingly, eagle-eyed fans spotted a sparkly ring on her left finger, which instantly sparked engagement rumors.

Ariana Grande performs with boyfriend onstage

The 23-year-old pop star bravely performed for a crowd of more than 50,000 following the Manchester attack after her "Dangerous Woman" concert last May 22.

The terrorist-led attack killed more than 20 people and hundreds injured, mostly young fans. Ariana Grande returned to Manchester to spearhead the "One Love Manchester" benefit concert, which also featured artists including her boyfriend Mac Miller.

Wearing a simple outfit of jeans and sweatshirt with the words "One Love Manchester," Ariana performed a duet with her beau. They sang Miller's song "Dang!" and shared a sweet hug on stage. "Tonight is all about love, am I right?" the singer shouted to the audience.

'One Love Manchester' highlights

Emotions were flowing throughout the night as dozens of artists lent their talent to uplift everyone in the audience. The show was also televised live on BBC One.

The star-studded benefit gig included surprise performances by various megastars, including Katy Perry, who sang her hit song "Roar," and Justin Bieber, who led the crowd to chant the word "love" after singing "Love Yourself."

Miley Cyrus also performed an emotional duet of "Don't Dream It's Over" with her friend Ariana Grande.

Coldplay's Chris Martin took the stage to sing the Oasis hit "Don't Look Back In Anger," which he said was dedicated to Ariana. Oasis frontman Liam Gallagher surprised the crowd with an appearance and sang their hit single "Live Forever," while Chris Martin played the guitar. The Black Eyed Peas - sans Fergie - performed their iconic song "Where is the Love?," which the crowd sang along to.

One of the show's powerful and moving moments was when Ariana sang with the Parrs Wood High School choir and hugged the group's 12-year-old soloist. She ended the concert with a tearful rendition of "Somewhere Over the Rainbow." Ariana addressed her fans who bravely trooped to the concert venue and thanked them for being "loving, strong, and unified."

In the end, the fans, celebrities, and critics all praised the show for being bold and triumphant. "One Love Manchester" was able to raise more than £2 million in donations, which will be given to the victims' families.

Before the benefit concert, the pop star also visited the Royal Manchester Children's Hospital, where many of the victims are currently being treated.