A morning mix of entertainment headlines...

Hemsworth and Cyrus. (Michael Buckner/GETTY IMAGES FOR CFN)

James Cameron , director of “Avatar” and “Titanic,” has became the first solo explorer to venture alone to the deepest part of the ocean. He traveled to the Mariana Trench, about seven miles underwater and 300 miles southwest of Guam; he’s the first person to attempt to reach the Challenger Deep, the deepest part of the Trench, since 1960. Footage from Cameron’s expedition, which was sponsored by National Geographic, will appear in a TV special and 3D theatrical movie. That 3D movie should not be confused with that other soon-to-be-released 3D James Cameron movie about the heart of the ocean. (Washington Post)

Brian Austin Green and Megan Fox are being sued by a photographer who alleges that Green assaulted him, with Fox’s encouragement, after the man snapped pictures of the couple on a Hawaiian beach. The paparazzo, Delbert Shaw, is seeking unspecified damages. (TMZ)

Watermelon-smashing comic Gallagher, who had been recovering from a heart attack two weeks ago, had another heart attack Sunday. After complaining of feeling ill, the comedian went to a hospital in Sedona, Ariz., where he had a second, mild attack. As of Sunday night he was reportedly awake and recuperating. (E! Online)

Chris Brown and Rihanna may appear onstage together at Supafest, a music festival in Sydney that Brown already is scheduled to headline on April 14. Feel free to start your outraged comment thread whenever you’re ready. (Vulture)

Lady Gaga’s “Born This Way,” NBC’s “Smash” and “Dancing with the Stars” were among the honorees at the GLAAD Media Awards, held Saturday in New York. (MTV)

For the record, Angelina Jolie did not pay any attention to that whole leg meme she inadvertently started during the Academy Awards. ”I don’t watch those TV shows and if I go online and see something about myself, I don’t click on it,” she told the Huffington Post. “And the people I surround myself with don’t really talk about that kind of stuff.” Clearly she’s hanging out with the wrong crowd. (Huff Post)

Don’t forget: We’re talking “Mad Men” at 11 a.m. today. Please bring your questions, comments and seductive performances of retro French songs to the discussion. Here’s the post-episode analysis to tide you over in the meantime.