The seventh-circuit affirmed the district court’s grant of summary judgment in favor of the employer, Froedtert Health Inc., dismissing a class action lawsuit brought by employee Nichole Lutz alleging violations of the Fair Labor Standards Act (FLSA) and Wisconsin state law regarding overtime and holiday pay calculations. The court held that Froedtert’s methodology for calculating overtime compensation was lawful under 29 U.S.C. § 207(a)(1) and its implementing regulations, specifically 29 C.F.R. § 778.109. Under the FLSA, an employer may calculate the regular rate by dividing total remuneration (including shift differentials and weekend bonuses) by total hours worked in a workweek, then paying an overtime premium equal to one-half of that regular rate for hours exceeding 40. The court rejected Lutz’s proposed method of segregating non-overtime and overtime hours for separate rate calculations, noting that her approach would create pay disparities between employees working identical hours with shift differentials depending on when those hours occurred within the workweek. Regarding holiday pay, the court ruled that Froedtert correctly excluded holiday premiums from regular rate calculations pursuant to 29 U.S.C. § 207(e)(6). The statute permits excluding payments for special days if they are paid at a rate of at least one and one-half times the bona fide rate applicable to like work performed on non-overtime hours. The court found that Froedtert’s holiday pay rates exceeded this threshold, thereby qualifying for exclusion. Including such premiums in the regular rate would create an unworkable “pyramiding” effect where overtime premiums are repeatedly added to the base rate, a problem the Supreme Court identified in *Bay Ridge Operating Co. v. Aaron*. The court further determined that Wisconsin law, which mirrors FLSA language regarding the “regular rate,” supports this exclusion and declined to certify the question to the Wisconsin Supreme Court as there was no genuine uncertainty regarding state law interpretation. Consequently, Lutz’s claims were dismissed with prejudice, and her motion for certification of a state-law question was denied.