The 28-year-old star apparently wants to start a family and is "rushing head first" into planning a pregnancy, reported OK! magazine.
"She's been telling people she'll be pregnant by the end of the year. She's rushing head first into this," a source said.
The news that the "Mean Girls" star, who is dating Mathia Milani, wants to have a baby has shocked her friends who think she is "crazy" to consider having a baby right now.
"It's crazy, because only a few weeks ago Lindsay was drawing up lists of guys to date," the source added.