Ariana Grandes Boyfriend Joins Concert Dance Party

's on-again boyfriend Ricky Alvarez was showing her the love at her Eternal Sunshine concert on Saturday night.

The one-time backup dancer didn't miss a beat or a word as he danced and sang along to her performance of Imperfect for You at Brooklyn's Center.

Wearing a plaid shirt and navy beanie, Alvarez joined the massive crowd in setting the mood by waving his phone's flashlight high above his head, as seen in fan footage posted by account Pop Culture HQ. 

He may have been Grande's biggest fan as the singer's breathy voice repeated the chorus: 'How could we know / We'd rearrange all the cosmos? Mm / We crashed, and we burned / Now I just can't go where you don't go….'

Alvarez, 35, who has transitioned from professional dancing to photography and directing in recent years, has been a fixture in Grande's life since news broke early last month that she and her Wicked co-star had parted ways.

Rumors of a began to spread after the San Diego native was spotted at her 33rd birthday show in Austin, on June 26.

He was seen shaking her dad Ed Butera's hand after she changed a lyric for him while belting out thank u, next, which is about several of the star's ex-boyfriends including Alvarez.

Instead of singing, 'Wrote some songs about Ricky / Now I listen and laugh,' Grande revised the live performance to, 'Wrote some songs about Ricky / We always find our way back.'

The day before, on June 25, while on a brief break from her tour, the three-time Grammy winner, Alvaraz and other friends went for lunch at a restaurant in Austin.

A source told the Daily Mail that Grande and Slater both decided to go their separate ways after a great deal of consideration.

The same source said the breakup, which happened several months ago, was amicable and the two were still on friendly terms.

Slater has not been seen at any of Grande's shows thus far.