Um Smartass I put the blind item first which states the actor and actress were friends and then he met her sister and knocked her up. Then I posted a guess which is going round the net that it's Rachel McAdams sister.
I wouldn't call Rachel a c-lister either (copy/paste). Everyone including these BI gossip sites has a different ideas of who is an A-lister. I know for example some people don't consider TV stars A-listers whereas I do. To me the abc etc scale isn't just movies it includes TV and music as well.
In these times when TV shows make bigger stars and movies, that certainly makes sense...