Find an image of a famous person on the Internet. Open it along with a photo of yourself in Adobe Photoshop.
Select the "Lasso" tool in the panel on the left side of the program. Make sure "Feather" at the box on the top left of your screen is set to a number higher than 0 pixels. With your image of the famous person open, click at a starting point around the individual and trace around them to cut.
Go to "Edit" and select "Copy" to copy the portion you cut with the lasso tool. Then, go to the photo of yourself and paste by going to "Edit" and selecting "Paste."
Move the newly pasted selection of the celebrity by using the arrow tool in the top left of the tools panel to place her exactly where you want.
Select the "Eraser" tool in the left-hand panel to blend around the cutout. Or, you can again use the lasso tool to select more of the portion around the celebrity and then hit the delete key. Both of those options will blend the portion into your photo.
Repeat the blending process as necessary. Activate your layers at the bottom right of your graphics program and click on the layer with the celebrity to fix any mistakes if you need to.
Go to "File" and "Save As" to save your completed image featuring you with the famous person.