She told Hollywoodlife.com: ''My best friend just gave birth and I have to say that she has a lot of milk coming in.
''[Jessica] will be squirting milk everywhere, so make sure to carry a pump because if you don't, you are going to have to suck it up yourself!''
Jessica - who engaged to NFL player Eric Johnson - is excited about becoming a mother for the first time, but also about being able to wear high heels again, as she is too heavy and unbalanced with carrying her baby at the moment.
She tweeted earlier this week: ''I can't wait for the day I can walk in heels again! My feet feel homesick!''
She was also overheard last month saying: ''I can't wear heels anymore. I tried but it was too hard. Wearing heels is like a religion to me, so it's tough!''