The 27-year-old singer is set to take to the stage at the glitzy award ceremony held at New York's Radio City Music Hall on August 20, and it has been reported her performance will honour the memory of the late DJ, who died earlier this year aged 28 in an apparent suicide.
Rita is believed to be performing 'Lonely Together', the last single released by Avicii late last year, which she featured on.
A music insider told The Sun's Bizarre column: ''Rita was hit hard by Avicii's death and she knew she wanted to do something special to properly celebrate him and his legacy.
''She has spoken about him on stage while performing the song but she was thrilled when the VMAs said they would like her to do something at the ceremony.
''Details have been kept secret but it will not be a straightforward performance.''
'Lonely Together' is also nominated in the Dance Video and Visual Effects categories at the awards show.
Following the Swedish musician's death almost four months ago, Rita took to Twitter to share her condolences to his family and friends, and said she was ''heartbroken'' by the tragic news.
She wrote: ''I have no words. I remember how amazing it was to make Lonely Together and it felt like just yesterday we were talking.
''Condolences to Avicii's family, friends, and the fans who supported him. May he rest in peace. Heartbroken.''
Meanwhile, artists including Ariana Grande, Logic, Shawn Mendes, One Republic, and Jennifer Lopez will also be taking to the stage throughout the evening to provide show-stopping performances.
Ariana is confirmed to be performing her new single 'God Is a Woman' for the very first time, whilst Shawn will be singing 'In My Blood', and Logic will perform 'One Day'.
The 2018 VMAs will air live from Radio City Music Hall in New York City on August 20.