Facinelli wrote, "Thanks a million. Here's Rob ..." And then, RPattz tweeted, "Hi, it's Rob ... My first and last tweet. My dad made me do it."
Through his rep, Facinelli tells Gossip Cop that Rob "relishes his privacy, but we were hanging out and he wanted to say hi to the fans."
Pattinson and Facinelli are currently filming "Eclipse" in Vancouver.
Who's Who of 'New Moon'
1. Kristen Stewart
Kristen returns as Bella Swan — but expect a more brooding, darker performance. Bella is heartbroken in “New Moon” after Edward leaves her — but things change when she grows closer with Jacob Black.
2. Robert Pattinson
In the novel, Edward is hardly seen, but in the film version of “New Moon,” RPattz fans will see plenty of Mr. Cullen. Audiences will see Edward appear as a figment of Bella’s imagination. Plus, he makes his long-awaited return to the screen after his brush with the Volturi in Italy.
3. Taylor Lautner
Jacob Black returns in a big way for “New Moon,” going front and center as Bella’s new love interest. Taylor packed on nearly 30 lbs. of muscle for the role.
4. Ashley Greene
Alice Cullen returns to Forks, Wash. when Bella’s near-death experience causes Edward to attempt the unthinkable.
5. Peter Facinelli
Readers learn more about Dr. Carlisle Cullen’s tumultuous history in “New Moon.”
6. Elizabeth Reaser
Elizabeth plays Esme Cullen, matriarch of the Cullen family.
7. Kellan Lutz
Kellan returns as Emmett Cullen, companion to Rosalie. Kellan dyed his natural blond hair brunette for the role.
8. Nikki Reed
Rosalie Hale is still not entirely fond of Bella in “New Moon.” In fact, she tells Edward that Bella might be dead — causing him to seek out the Volturi.
9. Jackson Rathbone
Jasper attacks Bella during her birthday celebration, causing Edward to fear for Bella’s life and blame himself for putting her in danger. Jasper’s actions are the catalyst for Edward’s decision to end his life.
10. Bronson Pelletier
Bronson plays Jared, a werewolf in Jacob’s pack.
11. Alex Meraz
Alex plays Paul, a werewolf prone to angry outbursts. Bella describes him as “a massive, crouched shape, ready to spring.”
12. Kiowa Gordon
Kiowa plays Embry, a member of Jacob’s pack.
13. Billy Burke
Billy returns as Charlie Swan, Bella’s father. Charlie is devastated when he can’t pull Bella out of her depression. He describes her as acting as if someone had died, and is delighted when Bella takes up with Jacob.
14. Chaske Spencer
Chaske plays Sam Uley, leader of the La Push werewolf pack and a major impact on Jacob’s life.
15. Edi Gathegi
Edi plays Laurent, one of the three nomadic vampires from “Twilight.” Laurent returns to kill Bella — but is unsuccessful.
16. Rachelle Lefevre
Rachelle plays Victoria, the villainous vampire bent on killing Bella. This is the last fans will see of Rachelle, though — actress Bryce Dallas Howard is replacing her in “Eclipse.”
17. Michael Sheen
Michael plays Aro, leader of the Volturi. Aro can read minds — and he has a dangerous fascination with Bella.
18. Charlie Bewley
Charlie plays Demetri, a member of the Volturi Guard known as a “tracker.” His tracking abilities are said to be better than James’.
19. Daniel Cudmore
Daniel plays Felix, a member of the Volturi Guard known for his immense strength.
20. Dakota Fanning
Dakota plays Jane, a powerful member of the Volturi who can inflict pain with a simple glance.
21. Graham Greene
Graham plays Harry Clearwater, father of Seth and Leah Clearwater and tribal leader of the Quileute tribe. Harry suffers from heart problems in “New Moon.”
22. Anna Kendrick
Anna plays Jessica Stanley, one of Bella’s first friends in Forks — but the two have a falling out in “New Moon” when Bella can’t pull herself out of her depression.
23. Michael Welch
Michael plays Mike Newton, a classmate with a crush on Bella. In “New Moon,” Mike asks Bella every day if she’ll come to work and nearly gives up on her.
24. Christian Serratos
Christian plays Angela Weber, who becomes one of Bella’s best friends in “New Moon.” Bella loves that Angela doesn’t talk as much as Jessica.
25. Gil Birmingham
Gil plays Billy Black, Jacob’s father and Charlie’s best friend. He’s among the first to find Bella after Edward leaves her in the woods.
26. Noot Seear
Noot plays Heidi, a member of the Volturi guard who lures humans to eat. She’s known as “bait.”
27. Cameron Bright
Cameron plays Alec, one of the Volturi’s most trusted guards. He is Jane’s brother and has the ability to make a person blind, deaf and numb to feeling.
28. Jamie Campbell Bower
Jamie plays Caius, a cruel and cold member of the Volturi who won’t let Bella leave Italy alive.
29. Justin Chon
Justin returns as Eric Yorkie, Bella’s classmate.
30. Tyson Houseman
Tyson (right) plays Quil Ateara, who becomes increasingly worried about Jacob being a werewolf in “New Moon.”
31. Chris Weitz
Director Chris Weitz replaces “Twilight” director Catherine Hardwicke for “New Moon.” His directing credits include “The Golden Compass” and “About a Boy.”