Since it's a British tabloid that wrote the item, could it be a British couple? Who knows British celebs? Are there any couples who fit the description of not-a-beard and not-gay??
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A loving person lives in a loving world. A hostile person lives in a hostile world. Everyone you meet is your mirror. -Ken Keyes Jr.
This would certainly explain why she was so eager to jump into this fake relationship. She broke up with her boyfriend, had a fling in Europe, got pregnant and needed to hide it from her very uptight Catholic parents and her fans. Tom needed a beard to generate some publicity for his movies. Hence the fast pace of this very scripted romance and the fact that they are not announcing the due date.