The Motown legend will serenade guests as her 25-year-old son ties the knot with Ashlee Simpson on the evening of August 31 in a romantic ceremony held at her own mansion in Greenwich, Connecticut.
The 70-year-old diva is going to be joined on stage by her daughter Rhonda Ross Kendrick, E! Online is reporting.
And Diana has pulled out all the stops to make the wedding an A-list affair, adding none other than Stevie Wonder and Smokey Robinson to the guest list and fuelling rumours of a one of a kind performance.
'The Hunger Games: Mockingjay' actor Evan previously admitted The Supremes singer was taking a very hands-on role in planning his wedding.
He said: ''[My mother is] involved in every part of our wedding [and] engagement party.''
Evan also revealed he was so desperate to be married to Ashlee - who has a five-year-old son, Bronx, from her marriage to Fall Out Boy star Pete Wentz - that he was considering eloping.
He said: ''Honestly, we could go and get married right now, wherever. We just want to be married. We're in love.''
When he's not focused on his on-line tuition, or stuck in the back of his brothers van mixing his latest compositions, GARGALO (Bruno G. Roth) is to...
As the days get progressively colder and shorter November ushers in celebrations of light, gunpowder and treason as well as bringing with it some...
If all things were equal then Ed Sheeran may have made the cut for our final five favourite new album releases of October, but they're not, and he...
We didn't expect these rockers to be so into the Swedish pop group.
Is there anyone worth mentioning that Dave hasn't worked with?
These deliciously witchy tunes are perfect for Halloween.
From Psycho Killer to the Monster Mash, these Halloween songs are classics.