Hayden Panettiere and costar Milo Ventimiglia get a little frisky with each other in between takes on the set of Heroes in Los Angeles on Saturday.

The loved-up couple playfully cuddled up behind a trailer, whispering in each other’s ears. Why was Milo gently pushing Hayden up against the trailer?? Hmm??

Hayden, 18, and Milo, 30, were later seen grabbing lunch together from the catering tent before returning to their trailers. The couple has been dating since late last year. Milo (Peter) plays the uncle of Hayden (Claire) on Heroes.

30+ pictures inside of Hayden and Milo getting hot and heavy on the set of Heroes… More Here! »

Hayden Panettiere is locked and loaded as she shoots (literally) a gun scene for her hit TV show, Heroes, in Los Angeles on Saturday.

Costar and real-life boyfriend Milo Ventimiglia was also on set filming scenes.

SPOILER ALERT!!!!!!!!!!!! E! also revealed details about the scene Hayden was filming: “In the first three minutes [of the season premiere,] one of the lead heroes is going to bust a cap off at one of the other lead heroes. And oh yeah, the guy she pulls the trigger on just might be the guy she’s playing tonsil hockey with in real life. She also tells him (on cam), “I always loved you.” We’re gonna see Claire-bear with dark hair and this also involves a shift in time.”

Translation: Claire Bear shoots her uncle, Peter.

25+ pictures inside of gun girl Hayden Panettiere… More Here! »

Heroes hunk Milo Ventimiglia, aka Peter Petrelli, works out a slick new hairdo and facial scar as he films season 3 of his his NBC drama in Los Angeles on Saturday.

Jimmy Jean-Louis, aka “The Haitian” was also on set filming scenes at the same time. And guess who also was on set? His on-screen niece and off-screen lover, Hayden Panettiere.

The two-hour season 3 premiere of Heroes airs on Monday, September 22 with episode “The Butterfly Effect.” More Here! »

Everybody together now: Awwwwww!

Hayden Panettiere and Milo Ventimiglia show some affection and give each other a big hug outside of Hayden’s trailer on the set of their TV show Heroes in Los Angeles on Thursday.

The now 18-year old actress recently shared the freedom of youth saying, “It’s great to be single. It’s great to have boyfriends. Or girlfriends. There are occasions when you kiss your best friend growing up, having fun and goofing about. Like perfecting your technique!”

More Here! »

Heroes star Hayden Panettiere meets and greets fans, including a svelte Darth Vader and an Imperial storm trooper, at the Big Apple Comic, Toy, Art and Sci-Fi Expo at the Penn Plaza Pavilion in Manhattan on Saturday.

While signing for her fans, Hayden received a cute dolphin plushie - a reference to the news she recently shared with E! on Wednesday: “I learned that they have an arrest warrant out for me in Japan… We just found out.”

Hayden, with several other activists, had attempted to block a dolphin pod from being hunted by fishermen in southern Japan in October 30.

11+ pictures of Hayden Panettiere, her new dolphin and sci-fi friends inside… More Here! »

On Friday, actress Kristen Bell takes her dogs for a late afternoon run at a local Los Angeles dog park with Veronica Mars co-star Ryan Hansen, who played the ridiculously slimy Dick Casablancas.

While at the park, the Heroes hottie took a cell phone call and then ran into SNL alum Chris Kattan. (Her new man did not make an appearance). From what we can tell in the photos, the two chatted and then got into a little playful shoving match… while Ryan discreetly tried to pick a wedgie.

Later on, Kristen and Ryan grabbed coffee, along with something that made Kristen pull a funny face.

21+ pictures of Kristen Bell, Ryan Hansen and Chris running with the dogs after the jump. More Here! »

Here’s Heroes‘ cutie Hayden Panettiere stalking the pink carpet in patent Loubutin slingbacks and an adorable black-and-white striped minidress at Thursday’s Victoria’s Secret Fashion Show in Hollywood.

The 18-year-old, who recently expressed her need for speed, not only loved the VS show, but proved herself a die-hard Spice Girls fan:

“I was dancing and singing along. I loved it,” raved Hayden. “The Spice Girls were great. I knew every word to the first song. Enough said.”

12+ pictures of Hayden on the VS pink carpet before the show, and at the after party - with James Van der Beek of eponymous Dawson’s Creek fame - following the jump! More Here! »

The Heroes cast party at their 2007 Pre-Emmy Party hosted by Perry Ellis and Vanity Fair at the Chateau Marmont on Friday in Los Angeles.

Pictured: Milo Ventimiglia, Masi Oka, Zachary Quinto, Hayden Panettiere, Sendhil Ramamurthy, Adrian Pasdar (with Dixie Chicks wife Natalie Maines), Ali Larter, Kristen Bell, Leonard Roberts, Dania Ramirez, Jimmy Jean-Louis, Santiago Cabrera, George Takei, Greg Grunberg and director David Semel.

45+ pictures inside of Heroes cast… More Here! »