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It is common for the wealthier person to pay the legal fees of both parties. Even if your lawyer is paid for by your partner, your lawyer is legally and ethically obligated to represent your interests. And the wealthier person, who wants the prenuptial agreement to be enforceable in the future, will want you to be represented by your own counsel.
The acutally cost varies based upon the attorneys used and their hourly rate as well as the time involved. Having stated all the above it is common for such an agreement to cost $1,500 to $3,000 if not too complicated.