LINDSAY LOHAN was left red-faced and speechless during a U.K. TV interview when she was cornered into discussing her sex life.

The Mean Girls star was appearing on British comedian Alan Carr's Chatty Man talk show when she was questioned about her on/off same-sex romance with DJ Samantha Ronson.

Lohan squirmed in front of the TV audience as the funnyman asked, "Let's get this straight, are you Arthur or are you Martha now? Are you back on the c**k?"

The actress shrieked before exclaiming, "You b**tard!" and burying her face in her hands. She then declared, "I'm not responding to that! I'm not discussing this."

Carr continued to press her, asking, "Will your next one be a man or a woman?"

A disapproving Lohan looked away before repeating, "I'm not discussing this!" She then snatched the host's interview notes and looked over them, explaining, "I just wanted to see if you have other questions. Any other things to discuss besides what's unnecessary?"

But the actress proved there were no hard feelings at the end of the chat as she shook Carr's hand and admitted, "You're very funny."