Ariana Grande and Mac Miller are engaged - One Love Manchester concert

And while the focus was firmly on ‘love’ and ‘unity’ – as well as sticking two fingers up to terrorists – some fans couldn’t help but notice a ring on her left finger and now believe the 23-year-old pop star may be engaged.

Speculation is rife that the sparkler could be an engagement ring as it looks like a pretty hefty rock, as well as the fact Ariana welcomed her 25-year-old beau Mac Miller onto the stage for a rather romantic duet last night.

The duo – who went public with their romance in September last year –  performed The Way on Sunday night, with Ariana telling the 50,000-strong crowd it was all about ‘love’.

And during some close-ups of Ariana, the ring could be seen in full view.

This fan said what everyone was thinking: Ariana’s engagement could never overshadow the amazing concert she put on, but it would still be pretty exciting if it turns out she is engaged.

I don't wanna take away from the amazing event we've just witnessed… but is ariana engaged ?!?! #OneLoveManchester pic.twitter.com/RqY09tXddy

— Francesca (@ryanhawley_) June 4, 2017

Soon, everyone was cottoning on.

Hold on ariana has a ring on her ring finger IS SHE ENGAGED

— beth loves ariana (@buterasreject) June 4, 2017

If Ariana & Mac are engaged I'm going to cry a river of tears I love them #OneLoveManchester

— Charlotte (@CharlotteJessL) June 4, 2017

Has Ariana just got engaged? I swear she wasn't wearing that ring just a moment ago???

— Megan Spanton (@MegannEllen) June 4, 2017

It's so under that mac miller and ariana grande are engaged

— lil propane tank (@KwameBlameless) June 4, 2017

Rumor .. mac and ariana are engaged pic.twitter.com/HsRFisCcms

— tojucomiroco (@rabit91) June 4, 2017

But these fans were having none of it, insisting it was just a dress ring.

Maybe Ariana is wearing the ring on her engagement finger cause she feels like it…i doubt she got engaged this past week…yall are extra

— donna (@gratefuljdb) June 4, 2017

Ariana isn't engaged she's had that ring on for soooo long! #OneLoveManchester

—  (@fentybillion) June 4, 2017

However, the ring could also be seen in photos of Ariana arriving back in Florida in the wake of the Manchester attack in May.

Mac joined Ariana on private jet last week as she returned to the UK with her family ahead of Sunday night’s benefit concert.

Before the concert, she visited the Manchester children’s hospital, showering the survivors of the attack, following her Manchester Arena concert, with gifts.

Reps for Ariana have been contacted for comment.