Young breakout starlet Megan Fox can truly say she knows the meaning of a single dollar bill. She knows how to save money on the small things in life.

Her secret formula? Simply add some water and let it grow. Well not literally, but Megan has shared her thrifty spending ways.  “Megan dilutes her shampoo, dish washing soap, milk and anything else she can to make it last,” a friend says.

“She grew up in a very thrifty home in Tennessee where money was tight, and her mom used to do it,” says another source. Although it does seem to annoy her fiance Brian Austin Green from time to time about her interesting unique habits Megan brings to the relationship.