While Cooper is 38, Waterhouse is 21, reports femalefirst.co.uk.
"Bradley and Suki have been talking about having kids next year. They've been inseparable and Suki told friends having kids is something she's thinking about," a source told The Sun newspaper.
"And Bradley has made no secret of wanting to be a dad," the source added.
Bradley and Suki met at the Elle Style Awards in February and have since been seen together on numerous occasions affectionately kissing and enjoying each other's company.