ELLEN DEGENERES has launched a blistering attack on JODIE FOSTER after hearing the Oscar winner is now romancing her ex-lover, "The L Word" actress ALEXANDRA HEDISON.

The 55-year-old talk queen's relationship with Alexandra, 44, ended bitterly, and now an insider says she's bad-mouthing Jodie, 50, because she believes the actress has betrayed her.

"Ellen feels Jodie is stabbing her in the back by hooking up with Alex," revealed a close source. "The lesbian community in Hollywood is very small, and it's well-known that Ellen and Alex had a very contentious breakup after Ellen got tired of Alex and hooked up with PORTIA DE ROSSI."

The usually warm-and-fuzzy comedian has been irritable lately, say pals, because she's been butting heads with wife Portia, 40.

"Ellen has been under constant stress from the demands of her daily talk show, and she's in a foul mood over the problems she and Portia are having," said the source. "Ellen is extraordinarily competitive, so it pains her to see Alex moving on with someone as successful and talented as Jodie.

"Ellen is also vindictive, and she's spreading the word among mutual friends that Jodie is pathetic for picking up her cast-off.

"But Jodie couldn't care less. she thinks ellen is a fool for letting such a good catch get away. Jodie had half a mind to send Ellen a note saying, 'Your loss is my gain,' but she isn't confrontational.

"As far as Jodie is concerned, Ellen can stew in her own regret and bitterness."