Robert Pattinson beamed from ear to ear when he walked into the Jimmy Kimmel Live studios in LA this evening. He made a low-key arrival wearing a Nike sweatshirt, though it seems he'll change into a Gucci suit to sit down with Jimmy. The Water For Elephants star is on the West Coast following his promotional appearances in NYC earlier this week. He kicked things off Sunday with Reese Witherspoon and Christoph Waltz at the world premiere, and later met up with his Breaking Dawn costar Kristen Stewart for a backseat PDA session. It's been a busy few days for Rob, who chatted with Ellen DeGeneres recently about "ass-baring" fight scenes and his "two-timing" love, Tai the elephant. Rob wasn't the only one to fall hard for his larger-than-life costar, as our IAHF winner quickly fell head over heels for the pachyderm too.

Mandy Moore cuddled a cute puppy today in NYC as she helped promote her new charitable cause. The animal-loving actress is teaming up with the ASPCA and PetArmor to help bring affordable pet medicines to dog and cat owners around the country. It's just one of several projects Mandy is currently working on. The trailer for Love, Wedding, Marriage, her upcoming romantic comedy, was just released, and she's also hard at work writing songs for her new, retro-inspired album. We had a chance to chat with Mandy this morning as she helped spread the word on keeping pets healthy, so stay tuned on PopSugar this week to watch our full interview with her! Not only did she tell us a little bit about the menagerie of dogs and cats she shares with her husband, Ryan Adams, but she also talked about what she's learned about married life and what it was like to play Twilight star Kellan Lutz's onscreen wife.

Kristen Stewart sported a cute, casual ponytail as she arrived at the Vancouver airport and headed out of town earlier today. Kristen was only in Canada for a couple days, since she kicked off the week in NYC with Robert Pattinson for his Water For Elephants world premiere on Sunday. Robert and Kristen were spotted kissing as they left the afterparty late that night and as he continued his promotional tour this week, and she was headed back to the set of Breaking Dawn to finish up some final scenes. There are rumored reshoots still coming up for Robert and Kristen, so perhaps they are not saying goodbye to playing Edward and Bella just yet. Some of their costars, including Kellan Lutz and Ashley Greene, just arrived in Vancouver yesterday for their last few days as Cullens, but the whole Twilight saga shooting should be complete by the end of the week.