BFF's Katie Holmes and Victoria Beckham are hatching a plan to combine their twin obsessions - fashion and kids - and launch a line of baby clothes.

"Katie drew sketches of a dress she wanted Suri to wear on her birthday, and they discussed it over a glass of wine," a source close to Beckham, 33, tells Us Weekly.

And though Holmes' rep says, "Katie is not starting a clothing company," the source insists "they've been talking about it for months."

The pair even want to enlist a pro from Gwen Stefani's L.A.M.B. line to help, adds the pal.

And apparently Holmes, 28, knows her way around a sewing kit: An employee of L.A.'s International Silk & Woolens says, "Katie comes in all the time. She makes pillows, curtains and all kinds of decorations for her home."