The 23-year-old songstress and the "Hunger Games" star don't want their guests to bring gifts on the wedding, reported Us magazine.
"The planning is going great. Miley and Liam do not want gifts. They're going to ask all of their guests to donate to a charity of their choosing," a source said.
The duo began dating after meeting on the set of their 2010 film "The Last Song", got engaged in 2012 before breaking up in 2013. They rekindled their romance late last year, and Cyrus has since been spotted wearing her engagement ring.