Melissa Etheridge and Linda WallemMelissa Etheridge revealed yesterday that she is dating Linda Wallem, the creator of the TV Show 'Nurse Jackie,' and ex-girlfriend Tammy Lynn Michaels is not happy with the new relationship.

PEOPLE reported that Etheridge and Wallem were best friends for years, and Wallem even served as "Best Man" at Michaels and Etheridge's wedding in 2003.

The two became an item a few months after Etheridge and Michaels split, stepping out together for the Emmys last August. A friend of the couple is quoted saying that the couple are happy and are in a "committed relationship." The couple even share the same birthday, and both turn 50 in May.

But Michaels took to her blog and wrote a long rambling poem where she tore into the new relationship and accused Etheridge of cheating on her long before the couple separated and eventually divorced in April 2010.