It's the two most adorable girls from across the pond -- SOPHIA GRACE & ROSIE! Since they were last here, they went on as the opening act for One Direction in the biggest Ellen show concert ever! They're telling Ellen what it was like performing in front of a crowd of thousands! It's the last time they'll be here before heading home for a few months, so don't miss this catch-up with Ellen before they return to the UK!

Then, when Ellen heard about this incredible family, she knew she had to do something to help. Their story will touch your heart, and you won't want to miss what happens to them next! They're in for the surprise of their lives, and they have no idea it's coming!

Plus, ALYSON HANNIGAN is here! From "American Pie" to "Buffy the Vampire Slayer" to "How I Met Your Mother," she keeps busy with some of the best projects in Hollywood, and her absolutely adorable family! She's talking to Ellen about it all today.

Ellen is starting off your week right this Monday!