The gown was said to be from Victoria's upcoming collection, reported Ace Showbiz.
"Victoria, 42, sent Geri a special dress from her own collection. Her new line features abstract hearts, so what better occasion to wear one than on honeymoon?" a source said.
"She also sent a touching message of love and support and a giant flower arrangement which was so big a PA was struggling to find space for it," the source added.
Geri married her fiance, Formula One boss Christian Horner, in a ceremony at St Mary's Church in Bedfordshire's Woburn Abbey in London on Friday, May 15.
Victoria who was bound to commitments in Singapore Fashion Week apologised for missing the wedding.