The 39-year-old Victoria Secret's designer is keen to put on a "high quality" birthday celebration, which will take place in April, and wants it to be the memorable one, reported Contactmusic.
"She's not holding back at all. Victoria was actually slightly dreading it before Christmas, but she has since been inspired by Kate Moss," a source said.
"Moss embraced the milestone birthday last week, and now Posh wants to do the same. She wants it to be one to remember with everyone she knows there," the source added.
"Gordon Ramsay has agreed to organise all the food for her too. But Vic plans to spend most of the party money on high quality alcohol," the source said.