Another new minhag which is close to becoming an old part of mesora is singing Im Eshkochaich at the Chupa.
I have a source for (at least something very similar to) this one:
The Taz in Orach Chaim 560:4 writes:
??? ????? ?? ??????? ????? ?? ????? ??????? ???’. ?????? ???? ?????
????? ???’ ????? ??? ????? ???? ????? ??? ???? ????? ???