It's Olivia Birkelund (ex-Arlene)!! Ahh Arlene, one of my all time favorite characters. She was a tramp without the heart of gold. Let's take a little walk down

She was who she was. She didn't care about anyone but herself. She hardly even cared about her daughter Hayley. But she kept trying to insinuate herself into Hayley's life. She even got a drunken Adam to marry her! Adam was so distraught over believing Stuart was dead (and not knowing that it was Arlene who mowed him down in her car while she herself was drunk!) that he married her. He didn't want anything more to do with anyone and thought by marrying Arlene he would successfully push his family away. Arlene even managed to get pregnant by Adam again, but ended up miscarrying the child.
As for Hayley, well Arlene always played like Hayley was her life but that didn't

