"They want their own biological baby so they've still got to find a suitable match," an insider explained. "Kim was thinking of asking her sister Kourtney, but she's had her fill of pregnancies."
"Khloe could also do but she's so loved-up right now, there's every chance she might want her own baby," continued the source.
"There's no doubt Kim's jealous as hell of Beyonce having twins and now she's determined to outdo her rival by having her own set, or even triplets, via a surrogate," revealed the insider.
Added the source: "She's been told she can't carry another baby so there's no other choice than using a surrogate."
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