When we heard that Britney was taking a break from the tabloid headlines and doing a guest appearance on one of our favorite comedies of all time, "How I Met Your Mother," we were pretty stoked. All the Britney hoopla should bring in enough viewers to get "Mother" off of CBS' endangered series list. (Cross your fingers!) Brit's one night stand on the show got us reminiscing about all of the other great guest stars that have appeared on the show. Click through this slideshow to see the stellar list of peeps we've met on "How I Met Your Mother."Friday, March, 21, 2008, 12:21 AM

… Britney Spears. Ted begins visiting his dermatologist quite frequently and ends up falling for the beautiful doctor. Meanwhile, the doctor's meek and unassuming receptionist, Abby (Britney Spears), begins crushing on Ted. In an effort to get his attention, Abby tries to clean herself up a bit, but ends up being as awkward as ever. Ted's too busy falling for the doctor to notice Abby's attempts at flirtation. Will Ted give up on impressing the doc and go for Abby? Can Brit-Brit be the mother?CBS/Monty Brinton - Friday, March, 21, 2008, 12:21 AM

… Sarah Chalke. Continuing his passionate quest to find the gal who will one day be his wife (the mysterious yellow umbrella-holding woman), Ted pursues his hottie dermatologist, Dr. Stella Zinman (Sarah Chalke). Tasked with removing his embarrassing butterfly tattoo, Stella turns down his repeated efforts for a date. We're guessing that his "tramp stamp" may have turned her off a bit.CBS/Monty Brinton - Friday, March, 21, 2008, 12:21 AM

... Vanessa Minnillo. Ted takes a page from Barney’s book of advice, throws caution to the wind, and lives like there's no tomorrow during a legen... wait for it... dary St. Patty's Day celebration. While out partying with Barney, Ted realizes that the universe has decided to reward him for acting like a jerk. When he does bad things, good things happen. The biggest reward comes when he gets hit on by a sure thing named Ashlee (Vanessa Minnillo), who turns out to be married. Ted's not sure he can continue on with the theme of the night, but doesn't get a chance to decide because he gets knocked out for a previous act of jackassery.CBS/Cliff Lipson - Friday, March, 21, 2008, 12:21 AM

... Heidi Klum. Barney gets a case of the Yips, which happens when you worry about something so much that it debilitates you. For Barney this means he's lost his mojo. In an attempt to get his mojo back, Barney scores tickets for him and the boys to attend the Victoria's Secret Fashion show after-party. Barney tries to hit on Heidi Klum, but all that comes out is "goobety goobety goobety," literally. Heidi advises Barney that in order for him to retrieve his mojo, he needs to go back to the "Man Maker" and show her that he's the best she's ever had and rock her world!CBS/Cliff Lipson - Friday, March, 21, 2008, 12:21 AM

... John Cho. Marshall is offered a job at a prestigious law firm and Jeff Coatsworth (John Cho) is the evil corporate lawyer who is sent to persuade Marshall to come over to the dark side. Coatsworth doesn't wear suits, offers Marshall a beer during the interview, feeds him Kobe lobster and introduces him to Crazy Swayze. He's so good at the art of seduction, Marshall begins to think that maybe Coatsworth isn't so evil after all. Marshall ends up drinking enough to agree to the job, forcing him to let go of his dream of saving the earth in favor of a hefty paycheck.CBS/Monty Brinton - Friday, March, 21, 2008, 12:21 AM

... Danica McKellar and Busy Philipps. Two beautiful women, Trudy (Danica McKellar) and Rachel (Busy Philipps), make it clear that they are both very attracted to Ted. Ted has a hard time trying to figure out which gal is more interested and soon discovers that the two friends are equally attracted to him. Making things even more complicated, Trudy and Rachel get Ted to take them to his apartment, where the gang helps him realize that bad luck doesn't always come in threes and guides him towards his goal of "riding the tricycle."CBS/Monty Brinton - Friday, March, 21, 2008, 12:21 AM

... Enrique Iglesias. Robin returns from her post-breakup vacation in Argentina with a new boyfriend named -- Kyle? Gail? Girl? -- Gael (Enrique Iglesias), who's a masseuse, a musician, a surfer and a wake-up call for Ted, who realizes that Robin has moved on and so should he. On a double-date with Robin and Gael, Marshall and Lily are determined to hate Gael, but his charms prove difficult to resist. Gael is so perfect he makes Robin, Lily, and even Marshall swoon.CBS/Cliff Lipson - Friday, March, 21, 2008, 12:21 AM

… Mandy Moore. When Robin shows up with an Argentinean Adonis by her side, Ted decides he is ready to hit the town with Barney as his wingman. Ted overcompensates with an evening that's a little too legendary even for Barney's taste, leading him into the arms of Amy (Mandy Moore), a trashy tattooed party girl who convinces him to get a butterfly tattoo, a.k.a. "tramp stamp," on his lower back. CBS/Monty Brinton - Friday, March, 21, 2008, 12:21 AM

… Emmitt Smith. When a funeral conflicts with the Super Bowl, the gang vows to avoid hearing the score and watch it together on TIVO on Monday night. With money on the line, Barney reaches a breaking point and is determined to find out the score of the big game. He runs into Emmitt Smith and demands to know who won, but it turns out Emmitt Smith was too busy with his dancing to watch the Super Bowl. What!?! CBS/Monty Brinton - Friday, March, 21, 2008, 12:21 AM

… Bob Barker. Certain that Bob Barker is his father, Barney thoroughly preps for his appearance as a contestant on "The Price Is Right." He practices his run to the stage and even uses a bicycle wheel to perfect his wheel-spinning skills. Once on the show, Barney wins every game with the hopes of impressing daddy dearest. When the opportunity finally arises for Barney to tell Bob Barker that he's his father, Barney chickens out.CBS/Monty Brinton - Friday, March, 21, 2008, 12:21 AM