Because the brightly shining sun might have you thinking about revamping your look for spring, take some inspiration from celebs whose looks we didn't always love. These fabulous ladies stepped up their wow-factor with simple hair and makeup changes. Here we share how you can replicate them using affordable beauty products from Walmart.

Then: An uneven skin tone, barely there makeup, and pulled-back hair made Hathaway look a bit mousy and, sorry to say it, boring.

Now: The starlet let her hair hang down in a glam, well kept 'do, she evened out her skin tone with perfectly applied makeup, and went for berry lips and cheeks -- making her appear more mature and less "Princess Diaries" girlish.

How to get it: Even out your skin tone using Physician's Formula Mineral Wear Correcting Powder, $13.95. Then pick a lip stain like Cover Girl Outlast Lipstain in Berry Smooch, $8.24 to add a pop of color to your face -- in seconds.

Then: While Underwood's skin has always looked smooth and flawless, her pastel purple eyeshadow and stick-straight, blonde strands looked a bit too teenager-like and amateurish.

Now: What a difference a little coral blush can make. It instantly brightens up Underwood's face, and when paired with black liner and tons of mascara she looks totally professional and stunning. Her shorter, more voluminous hairstyle and tweaked blonde hue completes the look.

How to get it: For glowing cheeks, dust L'Oreal True Match Innocent Flush Blush, $6.44 on your apples. And for smoldering eyes, line them with N.Y.C. New York Color Waterproof Eyeliner Pencil in black, $4 and finish with multiple coats of very black mascara (try L'Oreal Paris Telescopic Carbon Black Mascara, $6.99).

Then: Barrymore is naturally gorgeous, but sometimes her "I don't really care" style doesn't serve her well, especially on the red carpet.

Now: Not only has she transformed her hair color from basic brown to a bold, flirty blonde, but Barrymore gave her skin and lips a rosy glow that she can easily wear on the red carpet or at a casual Sunday brunch.

How to get it: To get bold berry cheeks and lips like Barrymore's, try Cover Girl & Olay Simply Ageless Sculpting Blush in Berry, $10.24 and Sally Hansen Diamond Lip Treatment in Royal Romance, $5.18. And if you're brave enough to try a totally new color (a blonde like Barrymore's perhaps?), use a product that'll get you there in 10 minutes (try Clairol Nice 'n' Easy Perfect 10, $11.99).

Then: It was hard to see this little lady with unkept hair and dull skin, when she had so much glam potential.

Now: Holmes' sleek haircut and flawless, no-makeup makeup look helped her shed her girl-next-door vibe. This chic style helps her send out that message that she's ready to take on the world, or at least the A-list.

How to get it: To get a natural glow, blend a bronzer like Neutrogena Healthy Skin Sunkissed Bronzer Blends, $10.99 on your forehead, cheeks, nose and chin. And complete the no makeup look by slicking on a nude lipstick like L'Oreal Colour Riche Lipstick in Naturally Nude, $7. And if you have a short cut like Holmes' copy her wet look by coating already wet hair with gel (try John Frieda Root Awakening Strength Restoring Gel, $6.49) and creating a deep side part.